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Rev. D

2 — Using the Controls

2 — Using the Controls

2 — Using the Controls

2 — Using the Controls

Page 13

POWER Key

14

CONTRAST Key

14

SAVE/MOB Key

15

Function Keys

16

Menu Keys

17

Cursor Keys

17

Keypad

17

Special Display Windows

18

HIS SECTION describes each of the Northstar 941X's
controls. Use this section for learning what each con-

trol does and for an overview of using its various functions.

2

Using the Controls

T

Summary of Contents for 941X

Page 1: ...Northstar 941X Reference Manual S O F T W A R E V E R S I O N 2 0 5 30 SUDBURY ROAD ACTON MASSACHUSETTS 01720 508 897 6600 Copyright 1994 1995 1996 Northstar Technologies P N GM1100 Doc Rev D ...

Page 2: ......

Page 3: ...Massachusetts 01720 This warranty applies only to products in normal use It does not apply to units or circuit boards defective due to improper installation physical damage tampering lightning or other electrical discharge receivers or mainframes subjected to fresh water or saltwater immersion units with altered serial numbers or units repaired by unauthorized persons or in violation of Northstar ...

Page 4: ...re designed to be very useful navigation tools they are not substitutes for good seamanship The prudent navigator should never rely on any single device as the sole source of navigation guidance Exercise caution and good judgment whenever underway ...

Page 5: ... Functions 9 The Display Screen 10 Interfacing Capability 11 Using the Controls Using the Controls Using the Controls Using the Controls POWER Key 14 CONTRAST Key 14 SAVE MOB Key 15 Function Keys 16 Menu Keys 17 Cursor Keys 17 Keypad 17 Special Display Windows 18 Basic Navigation Basic Navigation Basic Navigation Basic Navigation Displaying Position Heading Speed 22 Position Plotter 22 Using GPS 2...

Page 6: ...ng Waypoints to a PC 44 Creating Routes 44 Saving a Route 47 Changing a Route 50 Waypoint Route Navig Waypoint Route Navig Waypoint Route Navig Waypoint Route Naviga a a ation tion tion tion Quick Start Waypoint 54 Navigating to Waypoints 55 Navigating Along Routes 59 Restarting the Course Line 61 The NAV LOG Function The NAV LOG Function The NAV LOG Function The NAV LOG Function What NAVLOG Does ...

Page 7: ...Navigation Options 82 Receiver Options 87 Port Setup Options 90 Service Options 91 Geodetic Datum 94 Installation and Interfacing Installation and Interfacing Installation and Interfacing Installation and Interfacing Mounting the 941X 100 Wiring the 941X System 102 Antenna Location 104 DGPS Antenna Coupler ACU 108 Interfacing the 941X 112 Programming the Output Ports 115 Appendix Appendix Appendix...

Page 8: ... ASSEMBLY 110 FIGURE 10 PL 259 UHF CONNECTOR 111 FIGURE 11 INTERFACE CONNECTOR MATING SIDE 113 FIGURE 12 200 PPNM OUTPUT BLOCK DIAGRAM 115 FIGURE 13 941X DIMENSIONS 132 Tables Tables Tables Tables TABLE 1 DATUM LIST 97 TABLE 2 INTERFACE CONNECTOR PINS 114 TABLE 3 PORT SETUP OPTIONS 116 TABLE 4 NMEA 0183 SENTENCE IDENTIFIERS 120 TABLE 5 CONNECTION TO NORTHSTAR 800 PORT A 123 TABLE 6 CONNECTION TO N...

Page 9: ...ounting 9 Special Functions 9 The Display Screen 10 Interfacing Capability 11 his section introduces you to the Northstar 941X navi gator outlining its various operational functions in stallation configurations and specifications Use this section to get a quick overview of what the 941X is all about and how you can use it to your best advantage 1 Introducing the Northstar 941X T ...

Page 10: ...ore based transmitters called bea cons and using them to display position fixes as accurate as 2 5 me ters You can also connect your 941X to any external source of DGPS corrections meeting the SC 104 standard such as the Northstar 8800 DGPS Sensor When you turn your 941X on for the very first time you may be greeted with a flashing exclamation point symbol in the lower right portion of the GPS POS...

Page 11: ...left of the screen to return to the main GPS POSITION screen The 941X is now ready to navigate For more on alarms see page 68 If you wish to proceed directly to navigating with the 941X skip to page 22 Your 941X was designed to be an easy to use full function GPS naviga tor understandable in the information it displays and dependable in its performance This Reference Manual is intended to compleme...

Page 12: ... hours a day optional internal DGPS Differential GPS Beacon Receiver for accuracy as good as 2 5 meters fast signal acquisition fast reacting accurate speed and course lat lon display built in plotter shows 1 your position relative to nearby waypoints 2 your recent track line 3 your intended course line and 4 avoidance areas all against a latitude longitude grid tide prediction software integrated...

Page 13: ...zing the operation and displays of your 941X including screen brightness WAYPTS ROUTES lets you enter or access waypoints and routes for navigation NAV LOG displays the progress of your current navigation plan today s trip and lets you modify it In addition to these function keys the SAVE MOB key instantly saves your position as a waypoint and provides a Man Overboard function for returning to the...

Page 14: ...that SA will remain in effect indefinitely Selective Availability effectively reduces GPS s absolute and repeatable accuracy from 30 meters roughly 100 feet 95 of the time to 100 me ters 330 feet 95 of the time This means that with SA you can expect to be within 300 feet of your intended position 95 of the time and be yond that area approximately 5 of the time At first this was accepted by most en...

Page 15: ...GPS when SA is in effect in repeatable accuracy Though susceptible to weather and characterized by a relatively limited range when compared to GPS it s a dependable system familiar to thousands of boat owners Since the 1970 s LORAN users have relied upon that system s ability to repeatedly get them back to a previously saved location with extreme accuracy Fishermen especially appreciated this capa...

Page 16: ...impervious to weather and your location on the surface of the earth You can receive position fixes at any time anywhere in any weather This far surpasses the absolute accuracy that is achievable from a good loran receiver in a strong signal coverage area in favorable weather conditions usually 600 feet If you are accustomed to using your Northstar loran s repeatable accu racy to return to within a...

Page 17: ...or connector pin wiring guide The 941X is designed to be yoke or flush mounted on your boat The unit is waterproof and can be exposed directly to the weather The GPS antenna should be mounted fairly low on the vessel to minimize the ef fects of pitch and roll and where it has a clear view of the entire sky The Beacon Receiver antenna if installed should be mounted fairly high like a loran antenna ...

Page 18: ...AA tide stations covering the entire U S coast including Alaska and Hawaii as well as much of the western Canadian coastline Tides may be shown for today or any other day you choose See page 71 for more information on using TideTrack The Liquid Crystal Display LCD and all controls are lighted for night time use The display is easily readable under all conditions from full sunlight to total darknes...

Page 19: ...or accepting data from other NMEA devices and an auxiliary port reserved for future use It also features an RS 232 port for input or output of SC 104 DGPS corrections and way point route or software program loading from a PC The 941X can be interfaced to a wide variety of devices including autopilots plotters ra dars etc Refer to Interfacing the 941X beginning on page 112 for more information CLEA...

Page 20: ...Page 12 1 Introduction 1 Introduction 1 Introduction 1 Introduction Rev D ...

Page 21: ...ey 14 CONTRAST Key 14 SAVE MOB Key 15 Function Keys 16 Menu Keys 17 Cursor Keys 17 Keypad 17 Special Display Windows 18 HIS SECTION describes each of the Northstar 941X s controls Use this section for learning what each con trol does and for an overview of using its various functions 2 Using the Controls T ...

Page 22: ...he self test the no tification SYSTEM TEST FAILED will remain on the screen until you acknowledge it with the press of any function key located below the dis play screen Return the 941X to the factory for service To turn the 941X off press the POWER switch and hold it in for at least one full second until the unit turns off Liquid Crystal Display LCD screens require a contrast adjustment to compen...

Page 23: ...MAX SAVED WPT function under DISPLAY OPTIONS see page 80 Press and hold the SAVE MOB button for three seconds to enter Man Overboard MOB mode The 941X saves your position and displays it in the plotter screen as an X The plotter screen is locked on the dis play showing your position and the MOB location The MOB location immediately becomes your current waypoint with new bearing and dis tance infor...

Page 24: ...have designated A picture of your position relative to the course line is displayed along with all the numeric information you need to steer directly to your waypoint Two versions of the steer display are available Press STEER once to see the version you were last using Press it again to see the other version The STAR key has several functions The first press displays any alarms and messages the 9...

Page 25: ...press the down arrow to move the cursor downwards to a particular field of data and press the right arrow key to move the cursor to a particular character in that field The 12 button alphanumeric keypad is used for entering numbers letters or special characters for waypoint coordinates names etc When the 941X is expecting you to enter numbers only such as for way point coordinates the keypad keys ...

Page 26: ...r Finally move the cursor to the next character position by pressing the right ar row symbol on the cursor key The keypad also contains CLEAR and ENTER keys for erasing or enter ing data that has been typed on the keypad Pressing the ENTER key is always the last step when entering or changing data or acknowledging an action The CLEAR key removes any data you typed before you press ENTER and sets t...

Page 27: ...t you acknowledge a command Information windows always appear with the word INFO in a small box Question windows appear when the 941X needs to know more about what you want to do A question mark will always appear in this type of window You must respond to any question window by pressing ENTER to answer YES or CLEAR to answer NO All other keys including the function keys are inactive when a questi...

Page 28: ...Page 20 2 Using the Controls 2 Using the Controls 2 Using the Controls 2 Using the Controls Rev D ...

Page 29: ...st basic yet impor tant navigation function available in the Northstar 941X determining your position Position coordinates may be determined from the GPS sat ellite system or you may display loran coordinates if you have connected a loran receiver For those who no longer have a loran receiver but wish to view their position in loran TDs the 941X can convert GPS coordinates into Phantom Loran coord...

Page 30: ...yed as latitude and longitude You may choose to display loran coordinates instead as described below Loran coordinates may be obtained from a loran receiver connected to the 941X or may be calculated by the 941X from the GPS position coor dinates The position plotter screen is a north up display and provides an over all view of the surrounding area and all nearby waypoints Press the POSITION key t...

Page 31: ...ss the ZOOM IN menu key to zoom in for a closer look at the area in the center of the screen Press the ZOOM OUT menu key to zoom out to see more area Each press of the IN or OUT key approximately halves or doubles the chart scale respectively The maximum zoom in screen displays an area that is approximately mile from the top edge to the bottom while maximum zoom out shows you an area that is up to...

Page 32: ...d on the screen Whether a lat lon grid is displayed on the screen To change any one of these use the up and down cursor keys to move the arrow to the item you want to change and press the EDIT menu key This will cause a large cursor to flash on the field indicating you should use the up and down cursor keys to select the option you want Press ENTER when done or CLEAR to restore the field to its or...

Page 33: ...d directly on the GPS POSITION screen The GPS position screen displays your latitude and longitude in large digits near the top of the screen If GPS data is not available dashes are displayed in place of the numbers The time of day and today s day and date obtained from the GPS satel lites are displayed at the bottom of the screen Near the bottom of the screen your Speed Over Ground and Course Ove...

Page 34: ...st ready to navigate 2D NAV navigating with 3 satellites in 2 D mode 3D NAV navigating with 4 or more satellites in 3 D mode POOR FIX tracking satellites with poor geometry accuracy COMM FAIL communication link to GPS sensor has failed unit needs repair In the upper right corner of the GPS POSITION screen is an indicator that shows whether Differential GPS DGPS corrections are in use If your insta...

Page 35: ...e this higher level of accuracy For the POSITION and STEERING screens the DGPS indicator is a large letter D For the plotter screen the DGPS indicator is the symbol DGPS To display more information about signals received from the GPS satel lites press the SATS menu key on the GPS position screen A screen is displayed showing the received Signal to Noise Ratio for each satellite and a map indicatin...

Page 36: ... satellites current positions and is not based on actual received signals You will usually see an HDOP value displayed immediately after the unit is turned on and before it is ready to navigate Press the RETURN menu key to return to the previous screen To display more information about DGPS corrections that are being re ceived press the DGPS menu key on the GPS position screen A screen is displaye...

Page 37: ...ion 2 SIGNAL SIGNAL SIGNAL SIGNAL The actual strength of the received signal should be as high as possible Varies with distance from beacon transmitter 3 NOISE NOISE NOISE NOISE Noise level measures the static caused by lightning and other atmospheric effects and should be low for best results See DGPS antenna mounting on page 112 for further details NOISE LEVEL VALUE MEANING 200 or less excellent...

Page 38: ...ed DGPS signal quality information for the 941X is available from the op tional internal beacon receiver or from an optional external Northstar beacon receiver Other brands of beacon receivers may supply DGPS cor rections but omit the additional signal information shown on the 941X s screen Press the RETURN menu key to return to the previous screen If you have a loran receiver connected to your 94...

Page 39: ...ITION screen You must set this to correctly match the GRI being used by your loran receiver for the 941X to accurately convert the loran s TDs to latitude longitude position fixes Loran warning indicators obtained from any Northstar 800 series loran receiver are displayed to the right of each TD These are loran TDs NOTE In order to display loran position coordinates on the 941X from an externally ...

Page 40: ...ig nal to Noise Ratio for each loran transmitting station is displayed graphically Press RETURN to go back to the loran position screen To temporarily display GPS coordinates and signal status press the CHECK GPS menu key The unit continues to navigate using loran and will display loran data the next time you return to the position screen To return to GPS signals for navigation repeat the steps sh...

Page 41: ...mmed ASF correction points To display Phantom Loran TDs as position coordinates first select Phantom Loran as the position source as described below 1 Press the STAR key until the USER CUSTOMIZATION screen is displayed 2 Press the NAVIGATION OPTIONS menu key THE NAVI GATION SOURCE line will be designated 3 Press the EDIT menu key 4 Press the up or down arrow keys to display PHANTOM LRN as the posi...

Page 42: ... to display the current status of the beacon receiver including SNR SIGNAL and NOISE values as previ ously described on page 29 Press RETURN when you wish to go back to the PHANTOM LORAN position screen The large letter displayed in the upper right corner of the display indicates differential GPS corrections are being received and used to improve the accuracy of the received data To return to GPS ...

Page 43: ...reating Waypoints 37 Avoidance Areas 39 Waypoint Lists 41 Coordinate Options 42 Updating Waypoint Coordinates 42 Editing Waypoints 43 Transferring Waypoints to a PC 44 Creating Routes 44 Saving a Route 47 Changing a Route 50 In this section we ll learn how to create waypoints use them to form routes and change them as necessary 4 Creating Waypoints and Routes ...

Page 44: ... Use the up and down arrows to move to the next line you want to enter When the entire screen is correct press the ENTER key The 941X will accept the full screen of data and store it in memory To enter numbers simply press the digits of the keypad The flashing cursor automatically moves to the next character Many items such as waypoint names accept letters as well as numbers Each key of the keypad...

Page 45: ...he 941X s memory first assign it a name The name can be from 1 to 6 characters long and it must differ by at least one character from any other waypoint name in the unit s mem ory Enter the desired waypoint name If you wish you may also enter up to 16 characters of descriptive information for the waypoint on the line be low the name the description is optional Creating Waypoints If the name you ch...

Page 46: ...and start over otherwise press ENTER when the screen is correct If you are entering coordinates as distance and bearing the 941X nor mally asks for these coordinates relative to your current position known as HERE To select an entirely different location from which distance and bearing are to be measured such as an existing waypoint press the FROM menu key A waypoint list is displayed You can pres...

Page 47: ... PLOT screen as waypoints with circles around them In addition an alarm will be given both as an audio beep and a flashing exclamation point on the screen if you should enter and avoidance area The 941X will display each avoidance area as a circle the size of the warning radius you entered For new waypoints enter a distance in the WARN RADIUS box at the bottom of the NEW WAYPT screen For ex isting...

Page 48: ... is in front of the ALARM AUDIO option 3 Press the EDIT ALARM menu key 4 Use the up down cursor keys to toggle the setting ON or OFF 5 Press ENTER to make your selection or CLEAR to leave it un changed NOTE If you do not want to be notified of any other navigational alarms set the ANCHOR DRAG CROSS TRACK ARRIVE RADIUS and DGPS alarms to OFF The audible alert will now only beep when you enter an av...

Page 49: ...ALPHA ALPHA ALPHA list all waypoints in alph list all waypoints in alph list all waypoints in alph list all waypoints in alpha a a a betical order betical order betical order betical order SAVED SAVED SAVED SAVED list all waypoints list all waypoints list all waypoints list all waypoints created via SAVE MOB created via SAVE MOB created via SAVE MOB created via SAVE MOB key key key key with most r...

Page 50: ...isplay the waypoint s coordinates on the right side of the screen in any of the following ways by pressing the COORD OPTION menu key 1 latitude longitude coordinates 2 coordinates originally used to save the waypoint TDs lat lon 3 distance and bearing from your position this is often the most useful way since it may be easier to visualize 3 miles north than the digits of lat lon coordinates The le...

Page 51: ...e UPDATE COORD menu key To change any information about a waypoint you have already stored except the type of coordinates used to save it use the EDIT WAYPOINT function Press the WAYPTS ROUTES key then the WAYPT LIST menu key to display a list of waypoints Use the up and down arrow keys to point to the desired waypoint Press the EDIT menu key You may change the name description coordinates and or ...

Page 52: ... most impor tantly can be reloaded into your 941X in the event they are accidentally erased or lost due to equipment failure Consult your authorized North star dealer for software and cable ordering information A route is a sequence of waypoints stored in the 941X You can store up to a maximum of 500 routes in the 941X s memory There are two meth ods by which you can create a route 1 constructing ...

Page 53: ... Page 45 Press the NEW menu key A screen is displayed asking you to enter the name of the new route Enter the name of the new route using the keypad and cursor arrow keys as described on page 36 and press ENTER The NEW ROUTE way points screen will be displayed ready for you to begin selecting way points to add to the route route name ...

Page 54: ...between the two existing waypoints of the route where you want the new waypoint to be located Follow the inserting waypoints procedure above for inserting this new waypoint into the route You can also create a new waypoint as you enter it into the route After pressing INSERT from the NEW ROUTE waypoints screen press NEW from the SELECT WAYPT screen Enter the name with description if you wish and c...

Page 55: ...XT WAYPT and PREV WAYPT menu keys to advance along the route or move back towards the beginning Use ZOOM IN and ZOOM OUT to display a smaller or larger area Press RETURN when finished viewing to go back to the previous screen A second way to create a route is to travel the length of the desired route pressing the SAVE MOB button at each location you wish to store in the route The 941X s SAVE ROUTE...

Page 56: ...e display to instruct the 941X to begin saving a route automatically A screen is displayed asking you to enter the name of the new route to be saved Enter the name of the new route to be saved using the keypad and cur sor arrow keys and press ENTER The 941X displays the message SAVING TO route name at the bottom of the ROUTES screen con firming that your route is now being saved route name ...

Page 57: ...nd date when the waypoint was stored You can access any of the 941X s navigating functions while you are sav ing a route automatically with the exception of editing the route you are presently saving If at any time you are unsure as to whether you are still saving a route or not press the WAYPTS ROUTES key then the ROUTE LIST menu key to display the ROUTES screen If you are pres ently saving a rou...

Page 58: ...ss WAYPTS ROUTES and then the ROUTE LIST menu key to display the ROUTES screen Use the up or down cursor keys to point to the route you wish to change Press the EDIT key The route name is displayed If you wish to change the route s name do so now then press ENTER If not press ENTER to continue A screen appears which displays the waypoints in the route and allows you to insert or remove waypoints f...

Page 59: ...ur route To remove a waypoint from the route use the up and down arrow keys to move the pointer to the waypoint and press the REMOVE menu key and then ENTER If you make changes to a route you are currently navigating along re member that the modified route is stored back in the 941X s memory but these changes do not appear in the copy of the route the 941X is fol lowing To make these changes take ...

Page 60: ... 52 4 Creating Waypoints and Routes 4 Creating Waypoints and Routes 4 Creating Waypoints and Routes 4 Creating Waypoints and Routes Rev D To plot an overhead view of the route press the QUICK PLOT menu key ...

Page 61: ... gation gation Page 53 Quick Start Waypoint 54 Navigating to Waypoints 55 Navigating Along Routes 59 Restarting the Course Line 61 In this section we ll begin navigating to specific waypoints and along routes and show you how to get back on course or follow a new course line to your destination 5 Waypoint and Route Navigation ...

Page 62: ...oint as a QUIK waypoint and will imme diately begin navigating to it To change the type of coordinates you want to enter from lat lon to distance and bearing or to loran TDs press the COORD TYPE menu key to show the type you wish to use Coordinates may be entered as 1 latitude longitude of any point in the world 2 distance and bearing from here your present position or from any waypoint in the 941...

Page 63: ...gating to the waypoint You can also press the STEER key to display this information at any time Two versions of the screen are available to choose from WAYPOINT TIP You can specify a waypoint to navigate to and store it perma nently in the 941X s database in one operation if you like While in the QUICK WAYPT entry screen just move the cur sor arrow up to the waypoint s name and change it from QUIK...

Page 64: ...on relative to the course line for precision steering Both steering screens are intended to guide you precisely along a course line which might follow a harbor channel or a line between shoals and sandbars The first STEERING screen displays your distance and bearing to the waypoint along with your Speed Over Ground and Course Over Ground on the upper part of the readout The digits are large and ca...

Page 65: ...of the screen displays your off course distance using a picture of your boat to show your distance from the course line In addi tion the direction of the boat on the screen indicates the direction your boat is actually traveling Note this may not be the same as your head ing if any current or wind is present When the picture of your boat points towards the course line you are moving closer to the ...

Page 66: ...e alert message then the CLEAR ALARM menu key to acknowledge and clear it The 3 D STEER display features a three dimensional view of your boat the current waypoint the course line to the waypoint and the locations of any other nearby waypoints It is intended to provide a comprehensive picture of your progress toward the waypoint NOTE As you pass a waypoint while following a route the image of the ...

Page 67: ...nates a single waypoint of the route The second designates a leg connecting two waypoints The two shapes allow you to start following a route in either of two ways 1 DIRECT TO WAYPOINT DIRECT TO WAYPOINT DIRECT TO WAYPOINT DIRECT TO WAYPOINT You may navigate directly from your pre sent position to a designated waypoint To start on a waypoint other than the first use the cursor keys to move the poi...

Page 68: ...pointer up or down the ETA will change for each way point This estimate is based on the Speed Over Ground figure displayed at the bottom of the screen To change this figure press the USUAL SOG menu key and enter the new value to be used in calculating the time Use the cursor arrow keys again to scroll through the Estimated Times of Arrival for different way points of the route To access the USUAL ...

Page 69: ...ove back to wards the beginning Use ZOOM IN and ZOOM OUT to display a smaller or larger area When you have finished looking at the plot press RETURN to go back to the previous screen When navigating from one waypoint to another you may find you have wandered off the intended course line Perhaps you may have avoided an obstacle or simply drifted slightly off course Whenever you are off course for a...

Page 70: ...you can continue directly to the waypoint Course 2 using the restart function described below To restart your course line from your present position display the NAV LOG screen or the POSITION PLOTTER screen Press the RESTART menu key then the ENTER key The 941X will recompute the course line to extend from your present position directly to the next waypoint re setting your cross track error to zer...

Page 71: ...OG Function Page 63 What NAVLOG Does 64 Logging Your Trip 65 Changing Your Trip 65 Adding Waypoints to the Trip 66 The Northstar 941X s NAV LOG function provides a quick and easy way to check on your progress along a trip and to make changes to it while you travel 6 The NAV LOG Function ...

Page 72: ...ely stored in the unit s memory NAV LOG provides two main functions It shows your progress along your trip and it lets you easily change the remainder of your trip Information for safe and efficient planning of your trip is updated as you travel Your Estimated Time of Arrival ETA at the last waypoint in the route is shown at the top of the screen and the Estimated Time Enroute ETE to each waypoint...

Page 73: ...waypoint you wish The dis tance and bearing of each leg is displayed For each waypoint you can display either the waypoint s description or the time of arrival at the waypoint Press the NAME ETA menu key to select one or the other The time of arrival displayed is the Estimated Time of Arrival based on your current speed for waypoints you have not yet passed Actual Times of Arrival are shown for wa...

Page 74: ...ress the NAV LOG key to display the waypoints of your current trip To add a waypoint to the end of the trip press APPEND WAYPOINT A list of the waypoints stored in memory is displayed Use the up and down cursor arrow keys to select the desired waypoint Press NEXT LIST if you wish to display the waypoints list in a different order Press ENTER to add the waypoint to the NAV LOG Repeat for any other ...

Page 75: ...k 71 Internal Differential Beacon Receiver 74 This section covers several special functions that enable you to change the 941X s audible alarms and screen ap pearance navigate using the unique TideTrack feature get the most out of the high precision positioning capabili ties of your internal or external Differential GPS DGPS receiver 7 Other Special Functions ...

Page 76: ... arrival circle radius set from ALARMS BACKLIGHT screen YES after 5 seconds ARRIVE you have entered the arrival cir cle of the current waypoint YES after 5 seconds PASS while navigating to waypoint perpendicular to track passed but arrival circle was not entered YES after 5 seconds CHANGING switching to next leg of route NOW NAVIGATING TO YES after 5 seconds AVOIDANCE AREA avoidance area circle ha...

Page 77: ...le to acknowledge before the flashing exclamation symbol was automatically cleared Each successive press of the CLEAR ALARM menu key displays the most recent message for each type of alarm Four of the alarm controls are adjustable as described below To change any of these use the up and down cursor keys to move the arrow on the screen to the control you want to edit Press the EDIT ALARM menu key U...

Page 78: ...to specify the dis tance the boat can be expected to move on its anchor chain plus a safety factor to allow for GPS or loran inaccuracy 6 Press ENTER Remember to turn the ANCHOR WATCH alarm off before intentionally moving away from the anchor drop point The cross track alarm allows you to specify the maximum distance the boat will be permitted to move from the track line without sounding an alarm ...

Page 79: ...ve set for the current waypoint The DGPS ALARM signals when the 941X has operated without differ ential corrections beyond the DGPS data timeout limit See DGPS data timeout beginning on page 89 for details 1 If you want to activate the audible DGPS timeout alarm move the cursor arrow to DGPS ALARM 2 Press the EDIT ALARM menu key 3 Use the up down cursor keys to turn the alarm on or off and press E...

Page 80: ...displayed The center of the screen shows a graphic representation of the tide height for the entire day Maximum and minimum heights are shown as dashed horizontal lines labeled with the height in feet Mean Lower Low Water MLLW is shown as a solid line near the bottom of the picture A vertical line and arrow are positioned to show the tide level for the cur rent time At the bottom of the screen the...

Page 81: ...ow keys to point to the desired station and press ENTER twice to return to the TIDE TRACK screen and display the tides for that station The 941X will display NOAA tide stations within 100nm of any waypoint stored in its memory You can always store a waypoint just for the pur pose of locating tide stations in that area at a later date Refer to Creating Waypoints on page 37 for more information on s...

Page 82: ...or arrow to move to the month or digit you wish to change To change a digit press that key on the keypad To change the month use the up and down cursor arrow keys When the date is correct press ENTER twice Tide information for the new date is now displayed As we previously discussed in Comparing GPS and Loran beginning on page 5 use of differential corrections significantly enhances the accuracy a...

Page 83: ...41X with a Northstar beacon receiver enters automatic differential mode as soon as SC 104 DGPS corrections are received and requires no further supervision as far as differential operation is concerned The beacon receiver maintains automatic operation by using two independ ent receiver channels Channel 1 tracks the best available beacon signal the one with the lowest data error rate and sends the ...

Page 84: ... Use the right cursor key to highlight the digits you wish to change Enter the appropriate frequency and press ENTER when you are done You may also manually set the baud rate for the selected beacon fre quency However it is strongly recommended to leave the BEACON BAUD RATE setting at AUTO If the beacon receiver stops receiving differential data the 941X will continue navigating for a short time u...

Page 85: ...gation Options 82 Port Setup Options 90 Service Options 91 Geodetic Datum 94 his section explains the various options available to you for customizing the way your 941X displays informa tion to you computes navigation data and talks to other devices Each option is changeable at any time according to your specific needs Customizing the 941X T 8 ...

Page 86: ... in Greenwich England may be dif ferent from the day in your local time zone right screen above To change the time zone used for the time display both here and in other time displays press the TIME ZONE menu key and use the up or down cursor arrow keys to select the desired zone and standard or day light time Press ENTER to use the new time zone To access the 941X s display options press the STAR ...

Page 87: ...cator chart and is the default method of calculating distance and bearing to waypoints by the 941X Rhumb line navigation maintains a constant true direction to your desti nation seen as a straight line on a Mercator chart but is a somewhat longer route to travel over great distances than the Great Circle calcula tion A Rhumb Line course may be desired if a Great Circle route is likely to take you ...

Page 88: ...choices Press ENTER to make your selection or CLEAR to leave the option unchanged DISPLAY OPTIONS DISPLAY OPTIONS DISPLAY OPTIONS DISPLAY OPTIONS The 941X automatically assigns a sequential waypoint number for each point stored using the SAVE MOB button When this number reaches the designated value set using this function the unit starts over at 1 dis played as S001 and overwrites any old saved wa...

Page 89: ...istration card to Northstar This function asks you to enter this special four digit code before you can change the owner s message You can enter your individual owner ID message once you have received your registered owner access code card 1 Press the STAR key until you display the USER CUSTOMIZATION screen 2 Go to DISPLAY OPTIONS and move the cursor arrow down to OWNER S MESSAGE 3 Press the EDIT ...

Page 90: ...u key Use the cursor keys to scroll through available choices or the keypad to enter specific values NAVIGATION OPTIONS NAVIGATION OPTIONS NAVIGATION OPTIONS NAVIGATION OPTIONS The 941X s position displays and navigation to a waypoint are based on position information obtained from any one of four available navigation sources GPS an external loran receiver Phantom Loran coordinates calculated from...

Page 91: ...ngles is known as magnetic variation The 941X offers you the option of choosing from True True True True 0 Automatic Automatic Automatic Automatic the 941X calcu lates variation automatically according to your location and Manual Manual Manual Manual from 0 to 180 East or West settings The factory default is magnetic to coincide with your compass Your navigation charts will indicate the approximat...

Page 92: ...41X will display new distance and bearing information for the next waypoint upon arrival at the previous one It will immediately stop navigating when a lone waypoint or the last waypoint in a route has been passed To change the 941X s mode of waypoint switching position the arrow to the left of the WAYPOINT SWITCHING option and press the EDIT menu key Use the cursor arrow key to select AUTO or MAN...

Page 93: ...ting When your choice is displayed press ENTER The complete listing of 941X datums is found at the end of this chapter be ginning on page 94 NAVIGATION OPTIONS NAVIGATION OPTIONS NAVIGATION OPTIONS NAVIGATION OPTIONS The STEERING screen cross track display limits may be adjusted to suit your needs whether you are navigating in open waters or attempting to maneuver through a tight channel Adjustmen...

Page 94: ...modify the DISPLAY OPTION setting to enable your choice of either feet or meters in the cross track display NAVIGATION OPTIONS NAVIGATION OPTIONS NAVIGATION OPTIONS NAVIGATION OPTIONS The STEER DIST PRECISION function offers an extra level of accuracy to the distance to waypoint display on the STEERING and 3 D STEER screens Situated in the upper left portion of the screens the distance to waypoint...

Page 95: ...ined from the GPS satellite system are slightly er ratic varying by up to several knots The 941X s SPEED AVERAGING function can often improve the steadiness of these readings at the ex pense of a slightly longer display reaction time when the speed changes The time over which your speed is averaged by the 941X may be selected with this function with values between two and ten seconds available Ave...

Page 96: ... area It finds the beacon fre quency and data transfer baud rate then receives data fully automati cally If you prefer you can set the beacon frequency and baud rate manually to tune in a particular beacon transmitter Refer to the manual mode operation of the internal beacon receiver on page 75 For normal opera tion it is recommended that these controls be set to AUTO The beacon frequency can be s...

Page 97: ...to guarantee the highest accuracy In poor weather con ditions this value can be increased to a maximum of five minutes to ig nore occasional outages in the beacon reception if a minor loss of accuracy can be tolerated The default setting is 60 seconds To change the age of correction timeout use the up down cursor keys to move the arrow at the left of the screen to DGPS DATA TIMEOUT Press EDIT then...

Page 98: ...s option to hide any low satellites thereby preventing their use as sources of GPS position information and avoiding potential errors If needed this option is adjustable from 0 to 25 in 5 increments The 941X allows you to connect or interface directly with a variety of external devices such as autopilots radars depth sounders computers etc Connection is made through any of three data transmission ...

Page 99: ...e SERVICE INFORMATION menu key to display the following screen SERVICE INFORMATION SERVICE INFORMATION SERVICE INFORMATION SERVICE INFORMATION In addition to being affixed to the back of the unit your 941X s serial number is permanently programmed into memory at the factory Serial numbers ending with the letter D indicate that the unit contains an internal DGPS beacon receiver Be sure to have your...

Page 100: ... If all test parameters are met this field will say PASSED If the beacon receiver fails in any of the test criterion the message FAILED will be displayed In many cases the cause of the failure is an open or shorted antenna cable which can be repaired in the field If this is not the source of the failure return the 941X to the factory for service SERVICE INFORMATION SERVICE INFORMATION SERVICE INFO...

Page 101: ...ocated to the left of the display screen pressing SAVE MOB during the keypad test will save a waypoint in stead of testing the key Press and hold the CURSOR up or down key until you return to the SERVICE INFORMATION screen SERVICE INFORMATION SERVICE INFORMATION SERVICE INFORMATION SERVICE INFORMATION Press this menu key to display a listing of the 941X s interface cable wir ing colors and their i...

Page 102: ...NAME ELLIPS delta x delta y delta z ADI_MN ADINDAN Mean Africa CL1880 166 15 204 ADI_E ADINDAN Ethiopia CL1880 165 11 206 ADI_MA ADINDAN Mali CL1880 123 20 220 ADI_SE ADINDAN Senegal CL1880 128 18 224 ADI_SU ADINDAN Sudan CL1880 161 14 205 AFG AFGOOYE Somalia KRASS 43 163 45 AIN AIN EL ABD 1970 Bahrain Island INTL 150 251 2 ANA ANNA 1 ASTRO 1965 Cocos Islands AUSTR 491 22 435 ARC50_MN ARC 1950 mea...

Page 103: ... European 1950 Greece INTL 84 95 130 EUR50_IR European 1950 Iran INTL 117 132 164 EUR50_SA European 1950 Sardinia INTL 97 103 120 EUR50_SI European 1950 Sicily INTL 97 88 135 EUR50_NF European 1950 Norway and Finland INTL 87 95 120 EUR50_PS European 1950 Portugal and Spain INTL 88 109 122 EUR79 European 1979 INTL 86 98 119 GAND Gandajika Base Indian Ocean INTL 133 321 50 GD49 Geodetic Datum 1949 I...

Page 104: ...awaiian mean value CL1866 61 285 181 OHW_HW Old Hawaiian Hawaii CL1866 89 279 183 OHW_KA Old Hawaiian Kauai CL1866 45 290 172 OHW_MA Old Hawaiian Maui CL1866 65 290 190 OHW_OA Old Hawaiian Oahu CL1866 56 284 181 OMAN Oman CL1880 346 1 224 OSGB_MN Ordin Survey of Gr Britain 1936 mean value AIRY 375 111 431 OSGB_E Ordin Survey of Great Britain 1936 England AIRY 371 112 434 OSGB_IM Ordin Survey of G ...

Page 105: ...PR South American 1969 Peru SA1969 58 0 44 SA69_TT South American 1969 Trinidad and Tobago SA1969 45 12 33 SA69_VZ South American 1969 Venezuela SA1969 45 8 33 SASIA South Asia FS1960M 7 10 26 SEBAS Southeast Base INTL 499 249 314 SWBAS Southwest Base INTL 104 167 38 TIMB Timbalai 1948 Malaysia EVRST 689 691 46 TOK_MN Tokyo mean value B1841 128 481 664 TOK_JP Tokyo Japan B1841 123 483 662 TOK_KR T...

Page 106: ...Page 98 8 Customizing the 941X 8 Customizing the 941X 8 Customizing the 941X 8 Customizing the 941X Rev D ...

Page 107: ...g Page 99 Mounting the 941X 100 Wiring the 941X System 102 GPS Antenna Location 104 DGPS Antenna Coupler ACU 108 Interfacing the 941X 112 Programming the Output Ports 115 RS 232 Port 126 This section includes all the information needed to install your 941X and interface it to other equipment on your boat 9 Installation and Interfacing ...

Page 108: ... and monitoring system performance It is recommended that the unit be bench tested prior to installation on your boat This not only insures that the equipment is fully operational but it allows the GPS receiver to collect its almanac and ephemeris data for the installed location resulting in less installation time spent on the vessel Choose a mounting location for the 941X that allows good visibil...

Page 109: ... display screen The mounting location should be chosen carefully before any drilling or cutting takes place Be sure you have easy access to the control panel s keys and can clearly see the display from your normal vantage point when navigating your boat Even though the display screen contains an effective anti reflective coating choose a location where glare from win dows or other bright objects w...

Page 110: ...he power cable Replacement of the fusible link should be performed only by a qualified electronics technician Access to the link is gained by removing the 10 outer case screws to open the 941X then removing the 4 computer board screws and lifting the computer board out to expose the I O board below The link should be replaced with another short length of 30 gauge wire The 941X is a negative ground...

Page 111: ...ower wiring should be connected directly to the battery when possible for optimum noise immunity J1 Power Connector 3 wire J2 Main I O Interface Connector 18 wire J3 Auxiliary future expansion 10 wire J4 GPS Antenna Connector BNC J5 DGPS Antenna Connector UHF Figure 3 Rear Connectors The 941X should be connected to a source of 10 to 40 volt electrical power using at least 16 gauge wire A 10 foot p...

Page 112: ...on plane of any on board ra dar sets The antenna must be lower than any INMARSAT communications antenna The antenna should be as far as possible from other high power transmitting antennas Watch out for electromagnetic shading of antennas from rigging other vessels shoreline buildings etc Secure the cable well the center conductor is solid wire Whereas a loran antenna should be mounted high on the...

Page 113: ...VE SCREW Figure 4 941X GPS Only Antenna AN145 AN150 7 00 2 5 3 5 TNC Figure 5 941X Combo GPS DGPS Antenna AN190 Tools needed 1 flat bladed screwdriver 2 knife blade 3 Amphenol crimp tools The RG 59 cable supplied with your 941X has one TNC connector at tached to the antenna end of the coax Connection to the antenna itself involves the following steps mounting the GPS only antenna ...

Page 114: ...ot exceed 25 feet If a longer cable run is necessary use either the Northstar active or combo antenna for minimum lengths of 50 feet up to a maximum of 100 feet Runs between 25 and 50 feet require either the active or combo antenna and the minimum 50 foot length of cable The extra footage may be coiled up but not removed For applications with grounding problems or where optimum portability is requ...

Page 115: ...ny kind After the antenna has been mounted and the cable has been cut to length install the supplied BNC connector at the other end refer to Fig ures 6 7 and 8 on pages 107 and 108 A satisfactory crimp for this con nector may be made with a commonly available high quality crimping tool designed for use with BNC connectors Be sure the BNC connector is properly installed most system failures whether...

Page 116: ...ing for several minutes check that you have the proper length of cable matched to the type of antenna active passive or combo verify the quality of the antenna location and the quality of the connectors The Northstar 8410 Antenna Coupling Unit ACU supplied with the Differential GPS equipped 941X must be used in all differential GPS an tenna installations except in cases where the AN190 Combo GPS D...

Page 117: ...he 941X DGPS beacon receiver Essentially the ground system provides a secure connection to a large electrical mass ideally the earth itself On a vessel this means establishing electrical contact with the sea On a steel vessel a good connection to the hull or steel pilothouse is sufficient Wood or fiberglass vessels require a metal ground plate If the metal ground plate is impractical the engine bl...

Page 118: ... and Interfacing Rev D Figure 9 ACU Assembly WARNING WHENEVER ANY ANTENNA IS DISCONNECTED FROM ON BOARD EQUIPMENT BE SURE TO GROUND THE ANTENNA SHIELD IN ORDER TO DISCHARGE EXTREMELY LARGE STATIC VOLTAGES THAT CAN QUICKLY BUILD UP ON AN UNGROUNDED ANTENNA SYSTEM THESE VOLTAGES ARE HAZARDOUS TO PERSONNEL AND EQUIPMENT ...

Page 119: ...ing Page 111 Both ends of the differential beacon receiver antenna cable terminate in UHF connectors Follow the assembly instructions in Figure 10 for pre paring UHF connectors For best results coat these connectors with sili cone gel to retard corrosion Figure 10 PL 259 UHF Connector differential GPS antenna cable connectors ...

Page 120: ...n stallation Much like a loran antenna the effects of P static are minimized if the beacon antenna is mounted so that it is not the highest metallic object on the vessel The highest metal object acts much like a lightning rod at tracting tiny static discharges in the atmosphere If the beacon receiver antenna is the highest object these discharges can totally override the beacon signals and cause p...

Page 121: ...ize for outputting data to other instruments and two ports for inputting data from other devices PORT SETUP OPTIONS PORT SETUP OPTIONS PORT SETUP OPTIONS PORT SETUP OPTIONS A list of wire connections for the interface connector is built into the 941X s PORT SETUP OPTIONS screen accessed from the USER CUSTOMIZATION menu Press the WIRING INFO menu key to display the following screen Figure 11 Interf...

Page 122: ... SHIELD 9 EXTERNAL SAVE IN ORANGE w WHITE STRIPE 13 200 PPNM OUT Pulses Per Nautical Mile PINK 14 Table 2 Interface Connector Pins The Northstar 941X provides an open collector transistor output on pin 14 which is programmed to produce 200 pulses per nautical mile for those devices requiring this output The emitter of the NPN transistor is connected to ground and the col lector connects to the out...

Page 123: ... require ments of devices that conform to the NMEA 0183 data format specifica tion The SETUP function described below allows the selection of the specific 0183 sentences that will be transmitted by the 941X Press the STAR key until you see the USER CUSTOMIZATION menu Press the menu key marked PORT SETUP OPTIONS then press the PORT 1 SETUP or PORT 2 SETUP key A list of data format control options i...

Page 124: ...utes thousandths of minutes or ten thousandths of minutes OUTPUT RATE see page 122 choose 2 to 999 seconds for the interval at which data is sent to the external device NMEA 0183 waypoint ID as see page 122 choose NAME or NUMBER for the identifier of waypoints sent to the external device NMEA 0183 checksums see page 122 choose ON or OFF for compatibil ity with some older devices Table 3 Port Setup...

Page 125: ...ich may be individually turned on or off The 1 5 sentences BWC GLL and RNN enable the 941X to be back ward compatible with marine equipment previously designed for this earlier version of 0183 Details for using the 0183 format are given in the following section NMEA 0183 and RAY 0183 sentences on page 118 DATAMARINE CDX DATAMARINE CDX DATAMARINE CDX DATAMARINE CDX is required by Datamarine s cross...

Page 126: ... navigators for instance to talk to plotters radars charting in struments and other electronics by means of a common language When either NMEA 0183 or RAY 0183 is selected as the output format after pressing the EDIT menu key and ENTER is pressed a screen is displayed showing all of the available NMEA 0183 sentences that will be output by the 941X Some devices cannot handle all of these sentences ...

Page 127: ...ess the EDIT menu key 2 Use the up down cursor keys to toggle the sentence ON or off dashes and press ENTER to make your selection or CLEAR to leave it unchanged 3 Repeat for each sentence requiring modification Press the RETURN menu key to go back to the PORT SETUP screen when you are done If you wish to set all sentences to the factory defaults for recommended output press the SAFE RESET menu ke...

Page 128: ...oint Closure Velocity SOA WPL Waypoint Location XTE Cross track Error ZDA Estimated Time of Arrival ZTG Time To Go Table 4 NMEA 0183 Sentence Identifiers PORT 1 PORT 2 SETUP PORT 1 PORT 2 SETUP PORT 1 PORT 2 SETUP PORT 1 PORT 2 SETUP Part of the NMEA 0183 standard requires that the equipment you are interfaced to the listener know what type of device is transmitting the data The talker ID tells th...

Page 129: ...feet to XX XXX three decimal places thousandths of minutes or 6 feet to XX XXXX four decimal places ten thousands of minutes or roughly foot The factory default is XXX XXX XXX XXX thousandths of minutes The choice you make is dependent upon the equipment to which you are outputting NMEA data The 941X conforms to the NMEA version 2 10 standard but is also compatible with version 1 50 Equipment typi...

Page 130: ...ral equipment has this capability change the WAYPOINT ID AS field from NUMBER to NAME using the EDIT menu key then the up down cursor arrow keys Press ENTER The listening device will now display your six character waypoint names Certain older devices may not accept sentences containing the NMEA 0183 checksum that is output by the 941X In such cases the device may not operate properly if at all If ...

Page 131: ...ORT 2 Pin 7 brown 3 white w brown stripe 6 Pin H blue 1 brown w white stripe 2 Table 6 Connection to Northstar 800 Port B To configure the 800 for correct output format execute COMMAND 83 for output port A or COMMAND 84 for output port B Press the lower SELECT button until PRINTER 3 appears in the lower display and press ENT Then enter the following sequence to program the output parame ters AT TH...

Page 132: ...NMEA OUT violet 12 yellow 15 RETURN black blue w white stripe 8 black 10 GROUND Table 8 Yeoman Electronic Plotter Setup with 941X If your 941X is not equipped with an internal beacon receiver you can interface it with an external Northstar model 8800 8401 or 8400 bea con receiver or other source of differential corrections As described on page 74 differential corrections greatly enhance the accura...

Page 133: ...al NS Beacon Receiver For connection to other sources of differential corrections refer to the manufacturer s instructions for wiring information Now you re ready to set up the 941X to receive the data from the external source using the RS 232 interface port Press the STAR key until you display the USER CUSTOMIZATION SCREEN Press the PORT SETUP OPTIONS menu key The following screen will be display...

Page 134: ...other device that accepts them If you wish to download your waypoints to a personal computer or to have the unit upgraded by your dealer or the factory with new operating software you can connect to a PC using the RS 232 port Following are descriptions of the RS 232 port s various settings SC 104 OUT outputs differential corrections from your 941X s internal beacon receiver to an external device t...

Page 135: ... output the data format you wish to use by pressing the PORT 1 SETUP or PORT 2 SETUP menu key If necessary make changes now using the EDIT menu key and press ENTER then RETURN when you are done to return to the PORT SETUP OPTIONS screen 2 Change the RS 232 SETUP option if necessary to display the ap propriate COPY PORT 1 or COPY PORT 2 selection by pressing the EDIT menu key and using the up down ...

Page 136: ...Page 128 9 Installation and Interfacing 9 Installation and Interfacing 9 Installation and Interfacing 9 Installation and Interfacing Rev D ...

Page 137: ...ring Screens Steering Screens Large easy to read graphical presentation Waypoint name position Bearing and distance to waypoint Cross track error numeric and two graphic screens traditional and 3 dimensional Heading correction Speed Over Ground Course Over Ground Time to go Estimated Time of arrival Estimated Time Enroute Speed of advance Automatic magnetic variation NavLog NavLog NavLog NavLog Ar...

Page 138: ...rrent position Steer to new point function go to any waypoint or coordinates at any time Waypoint queuing Follow stored routes forward or backward Plot current route with other local data Plotter Functions Plotter Functions Plotter Functions Plotter Functions Plotter shows track history nearby wpts avoidance areas Speed Over Ground Course Over Ground Miscellaneous Functions Miscellaneous Functions...

Page 139: ...A GSV HSC RMA RMB RMC RNN 1 5 VTG WCV WPL XTE ZDA ZTG conforms to NMEA v 2 1 NMEA input sentences WPL and others Accepts external differential corrections Accepts external loran receiver Dimensions 10 8 W x 6 5 H x 3 3 D Slim mount anywhere waterproof unit 320 x 240 pixel high temperature backlit transflective graphics LCD Large 5 75 easy to read screen High contrast screen with anti reflection co...

Page 140: ...Page 132 Appendix Appendix Appendix Appendix Rev D Figure 13 941X Dimensions Dimensions ...

Page 141: ...g via PLL phase locked loop Data Processing Data Processing Data Processing Data Processing Demodulation MSK Minimum Shift Keying Data Decoding Parallel matched digital filters MSK Bit Rates 25 50 100 200 automatically selected Power Requirements Power Requirements Power Requirements Power Requirements Power Consumption 2 Watts Data Ports Data Ports Data Ports Data Ports DGPS Correction Output Por...

Page 142: ...C to 70º C Impedance 50 Ohm VSWR 2 0 1 Band Rejection 35dB 1625 MHz Power Handling 1 Watt Immunity to electromagnetic environment 1988 92 amend Evaluation Standard Radiated emissions IEC 945 1995 per 17 3 17 4 Low temperature IEC945 1995 per 4 5 4 2 4 Dry heat IEC 945 1995 per 4 5 2 Damp heat IEC 945 1995 per 4 5 3 Corrosion IEC 945 1995 per 4 5 10 Vibration IEC 945 1995 per 4 5 7 Rain test IEC 52...

Page 143: ...quires about 15 minutes to collect almanac data the first time it is turned on Thereafter it can usually use the alma nac data collected previously chain chain chain chain A group of loran transmitters comprised of a master station and at least two secondaries coverage coverage coverage coverage The extent to which a geographical area is encompassed by usable GPS or loran signals cursor cursor cur...

Page 144: ...tromagnetic interruption of a radio signal causing poor signal reception Interference may originate from external sources such as other radio transmitters or from the vessel itself such as alternator noise or precipitation static latitude latitude latitude latitude Imaginary lines on the earth s surface running East West and expressed in degrees 0 90 north or south of the Equator Used in conjuncti...

Page 145: ...rge which can build up on antenna surfaces result ing in poor radio reception readout readout readout readout The panel of graphic images and alphanumeric characters used by the 941X to display navigation data SNR SNR SNR SNR Signal to Noise Ratio Guide number for determining the relative quality of GPS DGPS or loran signals as compared to back ground radio noise TD TD TD TD Time Difference The me...

Page 146: ...able loran 7 8 9 updating waypoints 42 ACQUIRE indicator 2 ACU 101 108 109 110 112 133 ALARMS anchor drag 40 70 arrive radius 40 71 85 avoidance areas 40 cross track 40 70 listing of types 68 AN145 antenna 106 AN150 antenna 106 AN190 combo antenna 106 ANTENNA DGPS 103 108 111 112 GPS 9 101 103 104 106 107 arrive radius 40 71 84 asterisk 49 avoidance areas 4 5 10 22 23 39 40 42 43 46 B beacon recei...

Page 147: ... 76 89 DIAGNOSTIC port function 127 differential corrections 2 6 9 26 34 DISPLAY OPTIONS 78 distance and bearing 38 42 47 54 56 61 65 66 distance and speed units 79 drilling 101 E ephemeris 30 100 exclamation point flashing 2 18 39 68 69 84 F first start up 2 3 flashing cursor 17 30 36 135 flashing exclamation point 2 18 39 68 69 84 function keys 5 16 G GO TO menu key 55 GPS absolute accuracy 5 6 ...

Page 148: ...selecting as navigation source 32 34 82 with DGPS 7 with Selective Availability 6 7 8 GRI 31 34 54 grounding 100 109 H HDOP 28 I I D message 81 INFORMATION windows 19 input ports 11 113 114 118 125 127 INTERFACING compatibility 112 116 120 124 connector pin diagram 113 general 11 112 port setup 90 124 rear connectors layout 103 to external beacon receiver 88 124 to loran 5 9 16 22 30 31 83 to Nort...

Page 149: ... variation 83 man overboard 5 15 manual waypoint switching 84 maximum saved waypoint number 80 81 MOB See man overboard N NAV LOG key 17 65 66 NAVIGATION OPTIONS 82 NMEA 0183 9 31 90 112 115 22 noise 103 109 112 Northstar 800 31 32 123 O output ports 11 90 93 113 115 133 owner identification message 81 P parts list 101 personal computer 37 44 Phantom Loran 5 16 32 33 34 82 plotter 4 8 10 16 22 24 ...

Page 150: ...hanging 46 50 51 creating 44 49 following 51 plotting 4 22 47 52 saving as you travel 47 48 49 RS 232 11 115 125 126 133 S SA See Selective Availability SATELLITE acquiring 3 comprising GPS system 6 8 LOWEST SAT ELEVATION option 90 status 27 30 34 SAVE MOB 5 15 41 42 SC 104 DGPS corrections 2 11 125 126 133 Selective Availability 6 7 27 serial number 91 SERVICE INFORMATION 91 SKY SEARCH indicator ...

Page 151: ...57 60 64 65 of day 5 16 25 78 80 of sunrise and sunset 16 78 of tide levels 72 speed averaging 87 to waypoint ETE 5 57 60 64 TNC connector 105 106 track history 5 16 22 25 U user customization screen 78 W warning radius 39 43 WAYPOINTS arrive radius 84 as avoidance areas 23 39 changing 39 42 43 54 converting GPS coordinates to TDs 9 creating 16 37 44 46 displaying 4 17 24 50 displaying as TDs 9 en...

Page 152: ...2 49 saving as part of a route 44 49 switching to next auto 84 switching to next manually 84 transferring to a personal computer 44 updating coordinates 42 43 verifying entry 47 WAYPTS ROUTES key 5 16 37 43 44 54 59 wiring installation 102 wiring information screen 93 Z zoom 10 23 47 61 ...

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