Humminbird 541 Operation Manual Download Page 11

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How Sonar Works

Single Beam Sonar

(550, 560)

The

550 Fishfinder

and

560 Fishfinder

use a

200 kHz single beam sonar system with a 20°
area of coverage. Depth capability is affected by
such factors as boat speed, wave action, bottom
hardness, water conditions, and transducer
installation.

Summary of Contents for 541

Page 1: ...531716 4EN_A 550 560 561 570 and 570 DI Operations Manual 550 560 561 570 and 570 DI Operations Manual ...

Page 2: ...only be performed by authorized service personnel Any modification of the serial number or attempt to repair the original equipment or accessories by unauthorized individuals will void the warranty WARNING This product contains chemicals known to the State of California to cause cancer and or reproductive harm WARNING Do not travel at high speed with the unit cover installed Remove the unit cover ...

Page 3: ...e requirements please contact your dealer or distributor from which your product was purchased ROHS STATEMENT Product designed and intended as a fixed installation or part of a system in a vessel may be considered beyond the scope of Directive 2002 95 EC of the European Parliament and of the Council of 27 January 2003 on the restriction of the use of certain hazardous substances in electrical and ...

Page 4: ...Display Down Imaging models only 570 DI 13 Understanding the Down Imaging Display 15 Interpreting the Display 15 Down Imaging Sensitivity 16 Freeze Frame and Active Cursor 16 Views 17 Sonar View 19 Sonar Zoom View 20 Split Sonar View DualBeam PLUS and Down Imaging models only 561 570 DI 21 Big Digits View 22 Down Imaging View Down Imaging models only 570 DI 23 Down Imaging Sonar Combo View Down Im...

Page 5: ... User Mode Normal or Advanced 36 Sonar X Press Menu Sonar Views only 38 Sensitivity 39 Upper Range Advanced Sonar and Big Digits Views only 40 Lower Range 40 Chart Speed 41 Bottom View 41 Zoom Level Sonar Zoom View only 41 Down Imaging X Press Menu Down Imaging Views only 570 DI 42 Imaging Sensitivity 43 Upper Range Advanced 43 Lower Range 44 Chart Speed 45 Imaging Palette Down Imaging Views only ...

Page 6: ... Down Imaging only 570 DI 56 Depth Lines Advanced 57 Noise Filter Advanced 57 Max Depth Advanced 58 Water Type Advanced 58 Imaging Palette Down Imaging Views only 570 DI 58 Setup Menu Tab 59 Units Depth 60 Units Temp International models only 60 Units Distance with Temp Speed only 60 Units Speed with Temp Speed only 60 User Mode 61 Language International models only 61 Triplog Reset with Temp Spee...

Page 7: ...rized international distributors To obtain a list of authorized international distributors please visit our Web site at humminbird com or contact our Customer Resource Center at 334 687 6613 NOTE Entries in this Table of Contents which list with Temp Speed only require the purchase of separate accessories You can visit our Web site at humminbird com to order these accessories online or contact our...

Page 8: ...ator if there isn t a transducer attached to the control head NOTE See Start Up Options Menu for more information If a functioning transducer is connected Normal operation will be selected automatically at power up and your Fishfinder can be used on the water If a transducer is not connected and you wait too long to select a Start Up Option the system will default to whichever menu is already high...

Page 9: ... interpret location size and composition of an object Sonar is very fast A sound wave can travel from the surface to a depth of 240 ft 70 m and back again in less than 1 4 of a second It is unlikely that your boat can outrun this sonar signal SONAR is an acronym for SOund and NAvigation Ranging Sonar uses precision sound pulses or pings which are emitted into the water in a teardrop shaped beam Th...

Page 10: ...rovide a good balance between depth performance and resolution Low frequencies 83 kHz are typically used to achieve greater depth capability The power output is the amount of energy generated by the sonar transmitter It is commonly measured using two methods Root Mean Square RMS measures power output over the entire transmit cycle Peak to Peak measures power output at the highest points The benefi...

Page 11: ... 560 The 550 Fishfinder and 560 Fishfinder use a 200 kHz single beam sonar system with a 20 area of coverage Depth capability is affected by such factors as boat speed wave action bottom hardness water conditions and transducer installation ...

Page 12: ...conditions and transducer installation DualBeam PLUS Sonar 561 The 561 Fishfinder uses a 200 83 kHz DualBeam PLUS sonar system with a wide 60 area of coverage DualBeam PLUS sonar has a narrowly focused 20 center beam surrounded by a second beam of 60 expanding your coverage to an area equal to your depth In 20 feet of water the wider beam covers an area 20 feet wide DualBeam PLUS sonar returns can...

Page 13: ...depth Select 800 kHz for the sharpest image See Down Imaging X Press Menu Imaging Frequency for more information The transducer also uses conical beams to provide data in traditional 2D format see What s on the Sonar Display Select 455 kHz for a narrowly focused 16 center beam or select 200 kHz for a wider 25 beam see Sonar Menu Tab Beam Select Depth capability is affected by such factors as boat ...

Page 14: ...stance Distance traveled with Temp Speed Accessory Average Speed Average speed reading with Temp Speed Accessory Second Sonar Return When the sonar signal bouncesbetweenthebottomandthesurfaceofthe water and back again Use the appearance of the second return to determine bottom hardness Hard bottomswillshowastrongsecondreturn whilesoft bottomswillshowaveryweakoneornoneatall Speed If a Temp Speed ac...

Page 15: ...r fish icons and can be set to alarm when a fish of a certain size is detected When a target is detected a Fish ID symbol appears on the display with the depth displayed above it The size of the symbol indicates the intensity of the sonar return The unit will clearly show schools of Bait Fish as clouds of different shapes and sizes depending on the number of fish and boat speed Battery Voltage The...

Page 16: ...Real Time Sonar RTS Window appears on the right side of the display in the Sonar View only The RTS Window updates at the fastest rate possible for depth conditions and shows only the returns from the bottom structure and fish that are within the transducer beam The RTS Window plots the depth and intensity of a sonar return see Sonar Menu Tab RTS Window The Narrow RTS Window indicates the sonar int...

Page 17: ...d Active Cursor Freeze Frame and Active Cursor Press any arrow on the 4 WAY Cursor Control key and the screen will freeze and a cursor will be displayed Use the 4 WAY Cursor Control key to move the cursor over a sonar return and the depth of the sonar return will be displayed in the cursor dialog box The RTS Window continues to update in Freeze Frame To return to a scrolling display and exit Freez...

Page 18: ...pacted sediment or flat rock appears as a thinner line across the display A Soft Bottom such as mud or sand appears as a thicker line across the display Rocky Bottoms have a broken random appearance The sonar returns from the bottom structure and fish can be represented as Inverse Structure ID WhiteLine or Black Bottom Black See Sonar X Press Menu Bottom View to set the Bottom View Bottom Contour ...

Page 19: ...returns as dark pixels This has the benefit of ensuring that strong returns will be clearly visible on the display WhiteLine highlights the strongest sonar returns in white resulting in a distinctive outline This has the benefit of clearly defining the bottom on the display Black Bottom Black displays all pixels below the bottom contour as black regardless of signal strength This has the benefit o...

Page 20: ...hat list with Temp Speed are available if the accessory is connected Depth water depth can be set to alarm when the water becomes too shallow Temperature Water surface temperature Speed IfaTemp Speedaccessoryisconnected the Fishfinder can display the speed of the boat and can keep a Triplog of nautical or statute miles traveled Topography Changes The light part of the display shows where the beam ...

Page 21: ...rovide a clearer sonar return than mud and sand because hard objects reflect sonar better than soft objects Shadows Result from a lack of reflected sonar from a particular area and can be as valuable for interpretation than the sonar reflected by the object itself Use shadows to help you see the image in 3 dimensions oriented in space You can gain insight into the actual shape of an object or the ...

Page 22: ...de side to side but very thin front to back Use the light and dark parts of the display to interpret the objects under your boat as follows Dark shades represent soft returns mud sand or descending terrain Light shades represent denser terrain timber rocks or rising terrain A very hard bottom may appear as white on the display White Streaks or Clouds may represent fish on the display Shadows are n...

Page 23: ...inate the clutter from the display that is sometimes present in murky or muddy water See Down Imaging X Press Menu Imaging Sensitivity or Down Imaging Sensitivity for more information Freeze Frame and Active Cursor Freeze Frame and Active Cursor Press any arrow on the 4 WAY Cursor Control key and the screen will freeze and a cursor will be displayed Use the 4 WAY Cursor Control key to move the cur...

Page 24: ...ging View will be the default view Cycle When you press the VIEW key repeatedly the display cycles through the available views on your screen When you press the EXIT key the display cycles through the available views in reverse order Customize You can display or hide any view to suit your fishing preferences See the following pages for more information about each View NOTE When you change any menu...

Page 25: ...change the Digital Readouts Each view displays digital readout information such as speed or time which varies with the view selected and the accessory attached The digital readouts on the Sonar View can be customized See Setup Menu Tab Select Readouts for more information 1 Press the MENU key twice to access the tabbed Main Menu then press the RIGHT Cursor key until the Setup tab is selected 2 Pre...

Page 26: ...lay will change based on the Select Readouts settings or the optional purchase accessories attached see Setup Menu Tab Select Readouts Freeze Frame Use the 4 WAY Cursor Control key to freeze the display and move the cursor over a sonar return The depth of the sonar return will be displayed at the bottom of the screen in the cursor information box NOTE If the Depth number is flashing it means that ...

Page 27: ...he zoomed view updates automatically The Full Range View is displayed on the right side of the screen The Full Range View includes the Zoom Preview Box which shows where the zoomed view is in relation to the full range view The Upper and Lower Depth Range numbers indicate the high and low range of the water which is being viewed Sonar Zoom View Digital depth is displayed in the upper left hand cor...

Page 28: ...r returns from the 200 kHz narrow beam on the right side of the screen Down Imaging models 570 DI display sonar returns from the 455 kHz narrow beam on the left side of the screen and sonar returns from the 200 kHz wide beam on the right side of the screen Depth is displayed in the upper left hand corner The Digital Readouts in the Split Sonar View cannot be customized therefore information such a...

Page 29: ...cted to the Fishfinder NOTE The digital readouts in the Big Digits View cannot be customized The Triplog shows distance traveled average speed and time elapsed since the Triplog was last reset Big Digits View Depth Temperature Speed Timer shows the time elapsed since Triplog was last reset Distance is the distance traveled since the Triplog was last reset Voltage displays the battery voltage Avera...

Page 30: ...et the sensitivity of the sonar the chart scrolling speed the display palette and the Upper Range and Lower Range see Down Imaging X Press Menu Freeze Frame Press any arrow on the 4 WAY Cursor Control key and the Down Imaging View will freeze and a cursor will appear on the screen Use the 4 WAY Cursor Control key to move the cursor over a sonar return The depth of the sonar return at the cursor lo...

Page 31: ...onar the chart scrolling speed and the display color palette see Down Imaging X Press Menu and Sonar X Press Menu Freeze Frame Press any arrow on the 4 WAY Cursor Control key and the view will freeze and a cursor will appear on both views on the screen Use the 4 WAY Cursor Control key to move the cursor over a sonar return and the depth of the sonar return will be displayed in the cursor dialog bo...

Page 32: ...to use A combination of keys and special features allows you to control what you see on the display Refer to the following illustration and see Key Functions for more information Screen 1 MENU key 4 EXIT key 5 2 3 4 5 1 POWER LIGHT key 6 VIEW key 2 4 WAY Cursor Control key LEFT RIGHT UP or DOWN Cursor keys 3 6 ...

Page 33: ... Up Options Menu Power Off Press and hold the POWER LIGHT key for 3 seconds A message will appear to indicate how many seconds there are until shutdown occurs To ensure that shutdown occurs properly and any menu settings will be saved your Fishfinder should always be turned off using the POWER LIGHT key Adjust the Backlight or the Display Contrast Press the POWER LIGHT key to access the Light and ...

Page 34: ... the views in reverse order MENU Key The MENU key is used to access the menu system See The Menu System for more information Start Up Options Menu Press the MENU key during the power up sequence to view the Start Up Options menu X Press Menu Press the MENU key once in any view to access the X Press Menu which provides frequently used menu settings that correspond with the current view Main Menu Pr...

Page 35: ... on the 4 WAY Cursor Control key and the active cursor will appear on the screen EXIT Key The EXIT key has multiple functions which depend on the situation If an alarm is sounding press the EXIT key to cancel the alarm If a menu tab is selected press the EXIT key to exit the menu mode and return to the view If a menu is active press the EXIT key to return to the previous level in the menu system F...

Page 36: ... Normal Simulator and System Status X Press Menu The X Press Menu provides a shortcut to the most frequently used settings and the options on the X Press Menu correspond with the current view Main Menu The Main Menu is a standard set of menu settings which are organized under the following tabbed headings Alarms Sonar and Setup NOTE The X Press Menu s and the Main Menu options can also be expanded...

Page 37: ...modes described on the following pages Also see Power On for additional information Normal Use Normal for on the water operation with a transducer connected If a functioning transducer is connected Normal operation will be selected automatically at power up and your Fishfinder can be used on the water To exit Normal operation power off your Fishfinder ...

Page 38: ...aved for later use NOTE It is important to select Simulator manually from the Start Up Options Menu as opposed to letting the Fishfinder enter Simulator automatically as it will if a transducer is not connected and you do nothing during power up A message will appear often on the display to indicate Simulator mode To exit Simulator power off your Fishfinder System Status Use System Status to view ...

Page 39: ...ed Circuit Board PCB serial number software revision total hours of operation and the input voltage Accessory Test lists the accessories connected to the system NOTE The speed accessory will be detected only if the paddlewheel has moved since your Fishfinder was powered up System Status Accessory Test Screen Self Test Screen ...

Page 40: ...IGHT or LEFT Cursor keys to change the menu setting NOTE The X Press Menu will collapse temporarily and the screen will update if it is affected by your menu setting change which allows you to see the effects of your change immediately 3 Reactivate the X Press Menu by pressing the UP or DOWN Cursor keys Total Screen Update When you change any menu settings that affect the current view the view wil...

Page 41: ...ghlight a menu tab 3 Press the UP or DOWN Cursor keys to select a specific menu option under that tab 4 Press the RIGHT or LEFT Cursor keys again to change a menu setting A down arrow at the bottom of a menu means that you can scroll to additional menu options using the DOWN Cursor key A right or left arrow on a menu option means that you can use the RIGHT or LEFT Cursor keys to make changes or to...

Page 42: ...ime the menu will open to the same tab as the last time the Main Menu was displayed Note for all Menu Settings The settings in all menus are adjusted in the same way Simply use the 4 WAY Cursor Control key to highlight a menu option and then change the settings or activate the option see Main Menu or X Press Menu Below is an example of how the menu options are described in this manual Each descrip...

Page 43: ...ange the User Mode setting 1 Press the MENU key twice to access the Main Menu 2 Press the RIGHT Cursor key until the Setup tab is selected 3 Press the DOWN Cursor key to highlight User Mode on the Setup main menu 4 Press the RIGHT or LEFT Cursor keys to change the User Mode setting Normal Advanced Default Normal NOTE Any changes made while in Advanced Mode will remain in effect after you switch ba...

Page 44: ...37 Main Menu 570 DI Sonar Tab Advanced Mode 570 DI Sonar Tab Normal Mode ...

Page 45: ...hortcut to your most frequently used settings Press the MENU key once while in any of the Sonar Views to access the Sonar X Press Menu NOTE Menu options can be expanded or simplified by setting the Fishfinder User Mode to Advanced or Normal See Main Menu User Mode for details Sonar X Press Menu ...

Page 46: ...ns that may be of interest If the sensitivity is adjusted too high the display may become too cluttered Decrease the sensitivity to eliminate the clutter from the display that is sometimes present in murky or muddy water If Sensitivity is adjusted too low the display may not show many sonar returns that could be fish NOTE The Sensitivity setting is a global setting and will adjust the sensitivity ...

Page 47: ...layed in the lower right corner of the screen to indicate the unit is in Manual mode Adjust the Upper and Lower Range together to view a specific depth range especially when looking for fish or bottom structure NOTE A minimum distance of 10 feet will be maintained between the Upper and Lower Range regardless of the manual settings entered For example if you are fishing in 60 feet of water but are ...

Page 48: ...te possible for the depth conditions Bottom View Settings Inverse Structure ID WhiteLine Bottom Black Default Inverse Bottom View selects the method used to represent bottom and structure on the display See What s on the Sonar Display Bottom Presentation for more information Zoom Level Sonar Zoom View only Settings 2x 4x 6x 8x Default 2x Zoom Level sets the magnification level for the Sonar Zoom V...

Page 49: ...vides a shortcut to your most frequently used settings Press the MENU key once while in any of the Down Imaging Views to access the Down Imaging X Press Menu NOTE Menu options can be expanded or simplified by setting the User Mode to Advanced or Normal See Main Menu User Mode for details 570 DI Down Imaging X Press Menu ...

Page 50: ...y water If the sensitivity is adjusted too low the display may not show many sonar returns that could be fish Upper Range Advanced Settings 0 to 790 ft or 0 to 257 m International models only Default 0 ft Upper Range sets the shallowest depth range that will be displayed on the Down Imaging Views Upper Range is often used with Lower Range NOTE A minimum distance of 10 feet will be maintained betwe...

Page 51: ... screen to indicate the unit is in Manual mode Adjust the Upper and Lower Range together to view a specific depth range especially when looking for fish or bottom structure NOTE A minimum distance of 10 feet will be maintained between the Upper and Lower Range regardless of the settings entered manually For example if you are fishing in 60 feet of water but are only interested in the first 30 feet...

Page 52: ...s more information and is preferred by most anglers however the sonar information moves across the display quickly A slower speed keeps the information on the display longer but the bottom and fish details become compressed and may be difficult to interpret Imaging Palette Down Imaging Views only 570 DI Settings Dark Light Inverse Default Dark Imaging Palette allows you to select which monochrome ...

Page 53: ...wice to access the Main Menu The Alarms tab will be the default selection NOTE When an alarm is triggered you can silence it by pressing any key The alarm will be silenced and will not be triggered again until a new instance of the alarm condition is detected Alarms Menu ...

Page 54: ...sh ID alarm will sound when a large sized fish is detected Low Battery Alarm Settings Off 8 5V 13 5V Default Off Low Battery Alarm sounds when the input battery voltage is equal to or less than the menu setting The battery alarm will only sound for the battery that is connected to the Fishfinder The Low Battery Alarm should be set to warn you when the battery voltage drops below the safety margin ...

Page 55: ...ly Alarm Tone Settings High Medium Low Default Medium Alarm Tone selects the pitch of the alarm sound A brief tone will be produced as you adjust the Alarm Tone so that you can select the tone that you can hear best For example if the Temp Alarm is set to 58 degrees Fahrenheit and the water temperature falls from 60 degrees to 58 degrees the Temp Alarm will sound Similarly if the water temperature...

Page 56: ...Cursor key until the Sonar tab is selected NOTE Menu options can be expanded or simplified by setting the User Mode to Advanced or Normal See Main Menu User Mode for details NOTE Menu options are determined by your Humminbird model See the following pages for full menu descriptions 570 DI Sonar Menu Advanced ...

Page 57: ...inues to display the sonar returns from each beam in their respective windows The blended information is shown in the Sonar View Sonar Zoom View and the Big Digits View The RTS Window in the Sonar View will only show the returns from the 200 kHz narrow beam When set to 200 kHz only the returns from the 200 kHz narrow beam will be displayed in the Sonar View the Sonar Zoom View and the Big Digits V...

Page 58: ...onal sonar views When set to 200 kHz only the returns from the 200 kHz 25 beam will be displayed in the Down Imaging Views When set to 455 kHz only the returns from the 455 kHz 16 narrow beam will be displayed in the Down Imaging Views 75 Degree Total Coverage 16 25 455kHz 200kHz 75 455kHz 45 800kHz Sonar Menu Tab ...

Page 59: ...requency allows you to select which frequency to apply to the Down Imaging beams 455 kHz or 800 kHz For the best overall image quality and depth select 455 kHz For the sharpest image but limited depth capability select 800 kHz 75 Degree Total Coverage 16 25 455kHz 200kHz 75 455kHz 45 800kHz Sonar Menu Tab ...

Page 60: ...aw sonar returns on the display When Max Mode is selected you will see the maximum sonar information available within the transducer beam so more fish arches and better jig tracking are shown Choose Clear Mode to see less clutter and more fish size accuracy on the display When Clear Mode is selected the clutter is filtered and sonar returns are interpreted to provide more details about the objects...

Page 61: ...nd targets detected in the 83 kHz wide beam are represented as hollow fish symbols In Down Imaging models 570 DI targets detected in the 455 kHz conical beam are represented as shaded fish symbols and targets detected in the 200 kHz conical beam are represented as hollow fish symbols When Fish ID is turned off the Fishfinder shows only the raw sonar returns on the display These returns will often ...

Page 62: ...d in conjunction with Fish ID Fish ID must be On for Fish ID Sensitivity to affect the ability of the Fishfinder to identify sonar returns as fish Real Time Sonar RTS Window Settings Wide Narrow Off Default Narrow RTS Window sets the RTS Window to either Wide or Narrow or turns it off in the Sonar View The RTS Window always updates at the fastest rate possible and only displays returns that are wi...

Page 63: ...weak returns and decreasing the 83 kHz Sensitivity will display fewer weak returns NOTE 83 kHz Sensitivity is particularly useful for adjusting the sensitivity of the 83 kHz sonar returns in the Split Sonar View The 83 kHz sensitivity can be adjusted without affecting the sensitivity of the 200 kHz returns shown in the 200 kHz sonar window 455 kHz Sensitivity Advanced Down Imaging only 570 DI Sett...

Page 64: ...fault Low Noise Filter adjusts the sonar Noise Filter to limit interference on the display from sources such as your boat engine turbulence or other sonar devices The Off setting removes all filtering Low Medium High 1 High 2 and High 3 settings add progressive filtering of the sonar returns High 1 High 2 and High 3 are useful when there is excessive trolling motor noise but in some deep water sit...

Page 65: ...ishfinder cannot locate the bottom Water Type Advanced Settings Fresh Salt shallow Salt deep Default Fresh Water Type configures your unit for operation in fresh or salt water In salt water you can also choose the shallow or deep setting Water Type affects the accuracy of deep water depth readings In salt water what would be considered a large fish might be 2 to 10 times bigger than a large fish i...

Page 66: ... Menu then press the RIGHT Cursor key until the Setup tab is selected NOTE Menu options will vary depending on which accessories are attached to the unit NOTE Menu options can be expanded or simplified by setting the User Mode to Advanced or Normal See Main Menu User Mode for details Setup Menu Tab ...

Page 67: ...Miles Nautical Miles Default Statute Miles International Models Meters Kilometers Meters Nautical Miles Feet Statute Miles Feet Nautical Miles Default Meters Kilometers Units Distance selects the units of measure for all distance related readouts and will appear in the menu if a Temp Speed Accessory is connected and the paddlewheel has moved at least once Units Speed with Temp Speed only Settings ...

Page 68: ...r menus International models only Triplog Reset with Temp Speed only Settings Follow screen instructions to activate Triplog Reset resets the Triplog to zero and will appear in the menu if a Temp Speed Accessory is connected and the paddlewheel has moved at least once The Triplog provides the following information timer for elapsed time distance traveled since last reset and average speed NOTE See...

Page 69: ...ly Settings Various Default Off Select Readouts sets the information to display in each of the 6 fixed position data windows arranged around the left and bottom edges of the Sonar View and Down Imaging View screen To leave the data window blank select Off See Views to change the Select Readouts Data windows can display readouts from supported accessories such as Temp Speed Each data window can be ...

Page 70: ... the transducer to the waterline to read the depth from the waterline Enter a negative vertical measurement from the transducer to keel to read the depth from the keel Temp Offset Advanced Settings 10 0 to 10 0 degrees Default 0 Temp Offset will adjust the temperature readout by the amount entered Default Sonar View Sonar View with Select Readouts NOTE The availability of the digital readout infor...

Page 71: ... readouts such as Temperature and Depth The format can be changed to small format large format or no format Demonstration Settings Off Visible Default Visible Demonstration controls whether the Demonstration Mode is visible or off The Demonstration Mode appears on the screen if you don t press any keys during the warning screen at power up Menu settings cannot be saved in Demonstration see Power O...

Page 72: ...g removing corrosion from the battery terminals or wiring or actually replacing the battery if necessary Fishfinder Defaults to Simulator with a Transducer Attached A connected and functioning transducer will cause the newly started Fishfinder to go into Normal operating mode automatically If when you power up the Fishfinder it goes into Simulator mode automatically even though a transducer is alr...

Page 73: ...djusted A mix of air and water flowing around the transducer cavitation may be interfering with the interpretation of sonar data See your Installation Guide for suggestions on adjusting the transducer position Electrical noise from the boat s engine may be interfering with sonar reception See Finding the Cause of Noise for more information Sonar readings may be affected if the transducer is not po...

Page 74: ...noise re appears To determine whether the boat s engine is the source of the noise increase the RPMs while the boat is in neutral and stationary to see if the noise increases proportionately if noise appears when you rev the engine the problem could be the spark plugs alternator or tachometer wiring Replace the spark plugs with resistor plugs install an alternator filter or route the control head ...

Page 75: ...d and provides real time speed and temperature readouts as well as a valuable Triplog function NOTE If an external Temperature Speed TS W or Temperature TG W accessory is connected AND a transducer with temperature built in is connected at the same time the TS W or TG W accessory will override the temperature built into the transducer Be sure to check out our Web site humminbird com for additional...

Page 76: ...0 20 VDC LCD Matrix 240 V x 240 H Transducer XNT 9 20 T Transducer Cable Length 20 ft 6 m Current Draw 300 mA IPX Rating IP67 Waterproof Submersible 1 m for 30 minutes and dust tight NOTE Humminbird verifies maximum stated depth in saltwater conditions but actual depth performance may vary due to transducer installation water type thermal layers bottom composition and slope NOTE Product specificat...

Page 77: ...dB in 200 kHz Target Separation 2 1 2 Inches 63 5 mm Power Requirement 10 20 VDC LCD Matrix 320 V x 320 H Transducer XNT 9 20 T Transducer Cable Length 20 ft 6 m Current Draw 300 mA IPX Rating IP67 Waterproof Submersible 1 m for 30 minutes and dust tight NOTE Humminbird verifies maximum stated depth in saltwater conditions but actual depth performance may vary due to transducer installation water ...

Page 78: ...ower Requirement 10 20 VDC LCD Matrix 640 V x 320 H Transducer XNT 9 20 T Transducer Cable Length 20 ft 6 m Current Draw 300 mA IPX Rating IP67 Waterproof Submersible 1 m for 30 minutes and dust tight NOTE Humminbird verifies maximum stated depth in saltwater conditions but actual depth performance may vary due to transducer installation water type thermal layers bottom composition and slope NOTE ...

Page 79: ... in 200 kHz 16 10 dB in 455 kHz Target Separation 2 1 2 Inches 63 5 mm Power Requirement 10 20 VDC LCD Matrix 640 V x 320 H Transducer XNT 9 DI T Transducer Cable Length 20 ft 6 m Current Draw 300 mA IPX Rating IP67 Waterproof Submersible 1 m for 30 minutes and dust tight NOTE Humminbird verifies maximum stated depth in saltwater conditions but actual depth performance may vary due to transducer i...

Page 80: ... be visible in the sonar beam Precision sonar beams such as the Humminbird 20 beam have a smaller dead zone than wider sonar beams Decibel The measurement for sound pressure level or intensity of the sonar return See dB Down Point dB Down Point The standard decibel level at which the sonar cone angle is measured and is written as 10 dB or 3 dB Measurements at smaller down points bigger negative nu...

Page 81: ... Peak measurement systems Either method is acceptable but it is important when comparing power outputs to make sure that the same measurement system is being used for both outputs because P T P numbers are 8 times higher than RMS numbers Greater power output allows the sonar signal to penetrate through weeds and thermoclines reach deeper depths and operate more effectively in noisy environments su...

Page 82: ...eed Through Water is provided by a speed paddlewheel and is the measurement of the flow past the boat which may vary depending on current speed and direction Speed Through Water is most critical for anglers using downriggers as it impacts the running depth of the down riggers Speed Over Ground is optimal for navigation as accurate destination times can be derived from this measurement Humminbird p...

Page 83: ...l energy from the transmitter into sound energy and that forms the sonar beam in turn Internally the transducer consists of one or more piezo electric disks that expand by very minute amounts to create the sound wave This element also works in reverse converting the returned sound energy back into an electrical signal that the receiver interprets See SONAR Zoom A feature that focuses on a smaller ...

Page 84: ...g ways By Telephone Monday Friday 8 00 a m to 4 30 p m Central Standard Time 1 800 633 1468 By e mail typically we respond to your e mail within three business days service humminbird com For direct shipping our address is Humminbird Service Department 678 Humminbird Lane Eufaula AL 36027 USA ...

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