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18 

GMR 21/41 Owner’s Manual

Map Page with Radar Overlay          Radar Page

There are several Radar Options available on the Map Page. These 

options do affect operation of the radar and the Radar Page.

To display the Radar Options:

1.  Press 

ADJ/MENU

.

2.  Use the 

Rocker 

to highlight 

Radar Options,

 and press 

ENTER

.

 

GMR 21/41 O

PERATION

 > 

M

AP

 P

AGE

 R

ADAR

 O

VERLAY

Map Page Radar Options

Summary of Contents for GMR 21

Page 1: ...Owner s Manual marine radar GMR 21 41 ...

Page 2: ...d to print one copy of this manual or of any revision hereto provided that such electronic or printed copy of this manual must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited Information in this document is subject to change without notice Garmin reserves the right to ...

Page 3: ...s specifications and license requirements You can also find warranty and FCC information in the Appendix Use the Index as a key word search to help you find information more quickly Terminology Used Throughout This Manual This manual refers to the radome hardware as the scanner radar or GMR 21 41 These terms can be used interchangeably This manual uses the term chartplotter when referring to a Garmin...

Page 4: ... 6 Rain Clutter 7 FTC Fast Time Constant 7 Zoom 8 Target Expansion 8 Trails 9 Guard Zone 9 VRM EBL 10 MARPA 11 MARPA Setup 12 Hide Show Navigation Features 13 Additional Adjustment Menu Items 13 Map Cursor On Off 14 Setup 14 The General Tab 14 The Display Tab 15 The MARPA Tab 16 The Advanced Tab 16 Enter Standby Begin Transmitting 17 Map Page Radar Overlay 17 Appendix 19 European License Requireme...

Page 5: ...tter should detect the GMR 21 41 as a new network connection NOTE A software update may be needed for the GMR 21 41 to function properly If the message Incompatible Software Version is displayed when the chartplotter is powered on the software in the chartplotter needs to be updated A software update card is provided with the GMR 21 41 When the new radar is detected the chartplotter automatically ...

Page 6: ...ially be dangerous CAUTION The GMR 21 41 radar transmits microwave energy that has the potential to be harmful to humans and animals Before beginning radar transmission verify that the area around the scanner is clear The GMR 21 41 transmits a beam approximately 12 above and below a line extending horizontally from the center of the scanner Avoid looking directly at the scanner the eyes are the mo...

Page 7: ...us Bar along the top user configurable Digital Navigation Data down the right side a Heading Line and Range Rings Soft key options that allow quick access to radar functions and setting changes are displayed along the bottom of the page Status bar Range rings Zoom scale Ring separation Digital navigation data Soft key options Heading line GMR 21 41 OPERATION RADAR PAGE LAYOUT ...

Page 8: ... tick marks every five degrees The tick marks can help in quickly determining the azimuth to a target The lower scale represents the distance between the Range Rings Heading Line The Heading Line is shown from your current position along the path of your current heading Digital Navigation Data By default the Radar Page shows one column of digital navigation data with four data fields The Radar Page ...

Page 9: ...ustment Menu The Radar Adjustment Menu is a numbered list of options that allows direct access to the settings and features most commonly used on the Radar Page There are several adjustment options available Gain Sea Clutter Rain Clutter FTC Zoom Target Expansion Trails Guard Zone VRM EBL MARPA and Hide Show Navigation Features All adjustments are made using the Rocker or Data Entry keys GMR 21 41...

Page 10: ...y adjusted to provide optimal performance Manually adjusting the gain increases or decreases the receiver s sensitivity Increasing the gain may help to show a distant target but may also increase screen clutter To change the Gain setting 1 Use the Rocker to move the slider up or down 2 Press ENTER to accept the change To return the Gain setting to Auto move the slider to the Auto position or press...

Page 11: ...ain at close ranges Selecting Rain Clutter displays the Rain Clutter adjustment slider To change the Rain Clutter setting 1 Use the Rocker to move the slider to the desired setting 2 Press ENTER to accept the change FTC Fast Time Constant Adjusting the Fast Time Constant can help eliminate distant screen clutter caused by rain The Fast Time Constant has four presets Off Low Medium and High To chan...

Page 12: ...ted using the soft key options To move the selection box 1 Use the Rocker to move the pointer and highlight the edge of the selection box 2 Press ENTER to activate the Move function 3 Use the Rocker to move the selection box to a new location 4 Press ENTER to accept the move Target Expansion Target Expansion increases the size of a target Target Expansion has two settings On and Off The Target Exp...

Page 13: ...tting 1 Use the Rocker to select a new setting 2 Press ENTER to accept the change Trails Off Trails On medium To clear the Trails select Clear Trails on the Adjustment Menu or press the Clear Trails soft key Guard Zone A Guard Zone is a user defined area of protection If a target enters the defined Guard Zone an alarm is sounded Two Guard Zones can be defined at any given time The Guard Zone Menu has...

Page 14: ... can be moved allowing measurement from one target to another Two V E tools can be active at the same time The VRM EBL Menu has two areas VRM EBL 1 and VRM EBL 2 Each area has two settings Show Hide and Adjust To activate VRM EBL 1 or 2 Use the Rocker to highlight Show VRM EBL 1 or 2 and press ENTER The diameter of the VRM and the angle of the EBL are adjustable To adjust the VRM EBL 1 Use the Roc...

Page 15: ...ach for each target is displayed in the MARPA list NOTE The MARPA function requires the use of a heading sensor The heading sensor must output the NMEA sentence HDM or HDG at format 0183 v2 30 or higher The Gamin Marine Network has been tested using the KVH 1000 heading sensor using 6 second dampening MARPA relies on a Heading Sensor to provide accurate own vessel heading information Accurate head...

Page 16: ...riate symbol Acquiring Target Tracking Target To display the MARPA List Use the Rocker to highlight MARPA List and press ENTER MARPA List MARPA Setup The MARPA Setup Menu contains settings for Vector Length Target History Own Vessel Safe Zone Tine To Safe Zone Safe Ring Zone and Velocity Reference To display the MARPA Setup Menu Use the Rocker to highlight MARPA Setup and press ENTER 12 ...

Page 17: ...alarm is sounded The Safe Zone can be set to a distance between 01 and 2 nautical miles Time To Safe Zone sounds an alarm if MARPA determines that a target will intersect the Own Vessel Safe Zone within the defined time interval The time interval settings range from 3 to 24 minutes Safe Zone Ring displays a ring on the Radar Page depicting the Own Vessel Safe Zone Velocity Reference has two setting...

Page 18: ... General tab contains settings for Orientation Cross talk Rejection Front of Boat Offset Timed Transmit Timed Transmit XMIT Time and Timed Transmit STBY Time To change a Setup field option 1 Use the Rocker to highlight the field and press ENTER to show the field selections 2 Use the Rocker to highlight the selection 3 Press ENTER to accept the change The General Tab Orientation configures the Radar Pa...

Page 19: ...minutes that the radar is in stands by For example if set to 10 min the radar stands by for a period of ten minutes before referring to the Timed Transmit XMIT Time When the radar is standing by the scanner does not rotate or transmit however power is still applied to the Magnetron eliminating the need for a warm up cycle The Display Tab The Display tab contains settings for Center Offset Rings Ba...

Page 20: ... Navigation Features Waypoints Bearing Line and Course Line When selected that feature is displayed on the Radar Page Waypoints displays user waypoints on the Radar Page Bearing Line displays a bearing line on the Radar Page The bearing line is displayed as a line from your current position to the active destination waypoint similar to a traditional lollipop Course Line displays a course line from...

Page 21: ...smitting is enabled Selecting Begin Transmitting removes the scanner from Standby mode and after Spinning Up the scanner begins transmitting To select Enter Standby or Begin Transmitting Use the Rocker to highlight the Enter Standby or Begin Transmitting and press ENTER Map Page Radar Overlay Radar information can be displayed as an overlay on the Map page With radar information overlaid on the ma...

Page 22: ...eral Radar Options available on the Map Page These options do affect operation of the radar and the Radar Page To display the Radar Options 1 Press ADJ MENU 2 Use the Rocker to highlight Radar Options and press ENTER GMR 21 41 OPERATION MAP PAGE RADAR OVERLAY Map Page Radar Options ...

Page 23: ...Germany G Sweden G Greece G United Kingdom I Hungary Cyprus G Ireland Malta Italy G Iceland G Latvia I Norway I Lithuania G Switzerland I I Requires an individual license for operation G can be operated under a general license or license exemption This product may require licensing in your country of use Please refer to the national radio or telecommunications office or ministry APPENDIX EUROPEAN L...

Page 24: ... up to 95 at 35 C Beamwidth Horizontal beamwidth of 3 6 nominal vertical beamwidth of 25 nominal Range GMR 20 24 nm GMR 40 36 nm Wind Velocity Wind speed up to 100 Kts Antenna RPMs 24 rpm Range Ring Accuracy 1 meter Bearing Accuracy 1 Minimum Range 35 meters Range Discrimination 30 meters Sensitivity and Tune Controls Gain Sea Clutter Rain Clutter Frequency Tune Radar Chart Synchronization Overlay...

Page 25: ...equipment off and on the user is encouraged to try to correct the interference by one of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and the receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Declaration...

Page 26: ...ree not to export or re export the Software to any country in violation of the export control laws of the United States of America LIMITED WARRANTY This Garmin product is warranted to be free from defects in materials or workmanship for one year from the date of purchase Within this period Garmin will at its sole option repair or replace any components that fail in normal use Such repairs or repla...

Page 27: ...e for warranty repairs Products sold through online auctions are not eligible for rebates or other special offers from Garmin Online auction confirmations are not accepted for warranty verification To obtain warranty service an original or copy of the sales receipt from the original retailer is required Garmin will not replace missing components from any package purchased through an online auction N...

Page 28: ...ke additional information please refer to our Web site at http www garmin com prop65 Warning Failure to avoid the following potentially hazardous situations may result in injury or property damage Use the GMR 21 41 at your own risk To reduce the risk of unsafe operation carefully review and understand all aspects of this Owner s Manual and thoroughly practice operation using the simulator mode pri...

Page 29: ... i L Limited Warranty 22 M Manually Adjust the Scanner 17 Map Cursor 13 Map Cursor On Off 14 Map Page Radar Overlay 17 MARPA 5 11 MARPA function 11 MARPA List 12 MARPA Setup 12 MARPA Setup Menu 12 MARPA Tab 16 MARPA target 11 Mini Automatic Radar Plotting Aid 11 N Navigation Features 5 13 15 16 O Orientation 14 Overlay 17 Overview 1 Own Vessel Safe Zone 13 R Radar Adjustment Menu 5 Radar Configurat...

Page 30: ...26 GMR 21 41 Owner s Manual INDEX V Variable Range Marker 10 Vector Length 13 Velocity Reference 13 VRM EBL 5 10 W Warming Up 2 WARRANTY 22 Waypoints 16 Z Zoom 5 8 Zoom level 8 Zoom Scale 3 ...

Page 31: ......

Page 32: ...garmin com Copyright 2006 Garmin Ltd or its subsidiaries Garmin International Inc 1200 East 151st Street Olathe Kansas 66062 U S A Garmin Europe Ltd Unit 5 The Quadrangle Abbey Park Industrial Estate Romsey SO51 9DL U K Garmin Corporation No 68 Jangshu 2nd Road Shijr Taipei County Taiwan www garmin com Part Number 190 00665 00 Rev A ...

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