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                        Owner’s Manual
GMR 21/41
marine radar                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
                    
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                        ©  2006 Garmin Ltd. or its subsidiaries Garmin International, Inc. Garmin (Europe) Ltd. Garmin Corporation   st nd 1200 East 151 Street,  Unit 5, The Quadrangle,  No. 68, Jangshu 2 Road,   Olathe, Kansas 66062, USA Abbey Park Industrial Estate,  Shijr, Taipei County, Taiwan  Tel. (913) 397.8200 or (800) 800.1020 Romsey, SO51 9DL, UK Tel. 886/2.2642.9199  Fax (913) 397.8282 Tel. +44 (0) 870.8501241 (outside the UK)  Fax 886/2.2642.9099  0808 2380000 (within the UK)  Fax +44 (0) 870.8501251 All ri
                    
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                        IntroductIon > IIallnst ng Your gM 21/41 r and a bout t hIs Manual The Appendix contains specifications, regulatory information, and  IIntroduct on maintenance information. You can also find warranty, European  This manual covers the features and operation of the GMR 21/41  Licensing Requirements, and FCC information in the Appendix. marine radar when viewed on a Garmin marine network chartplotter. An Index is provided at the end of the manual for reference.  Installing Your GMR 21/41 Manual Con
                    
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                        IntroductIon > t able of c ontents Appendix ............................................................................14 Table of Contents Specifications ........................................................................ 14 Introduction ...........................................................................i European License Requirements ........................................ 15 Installing Your GMR 21/41 ....................................................... i Declaration of Confo
                    
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                        IntroductIon > Product r Ieg tIstra on and s areoftw l Icense a greeMent Product Registration Software License Agreement BY USING THE GMR 21/41, YOU AGREE TO BE BOUND BY THE  Help us better support you by completing our online registration  TERMS AND CONDITIONS OF THE FOLLOWING SOFTWARE LICENSE  today! Connect to our Web site at www.garmin.com/registration/. AGREEMENT. PLEASE READ THIS AGREEMENT CAREFULLY. Use this area to record the serial number (8-digit number located  Garmin grants you a lim
                    
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                        IntroductIon > w Iarn ng and IMPanttor InforMIta on Warning Failure to avoid the following potentially hazardous situations could For protection from lightning, this installation must conform to NFPA code,  result in an accident or collision resulting in death or serious injury. section 302. The installation of a lightning protective mast is recommended,  and the scanner must be connected to water ground using an 8 gauge copper  The radar scanner transmits electromagnetic energy. Ensure that the
                    
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                        b asIc o PtIera on > u andInderst ng r adar  CAuTION: The GMR 21/41 transmits microwave energy that  BIas c o tIpera on has the potential to be harmful to humans and animals. Before  This section covers the features and operation of the GMR 21/41. beginning radar transmission, verify that the area around the radar  is clear. The radar transmits a beam approximately 12° above and  below a line extending horizontally from the center of the scanner.  Understanding Radar Avoid looking directly at th
                    
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                        b asIc o PtIera on > u Iandnderst ng r adar Before transmission begins, the message “Spinning Up” is shown  Using Range Rings while the radar antenna reaches nominal rotation speed. After the  Use the Range Rings to quickly determine the distance to a target.  message disappears, the radar begins painting an image. The lower-right corner of the screen contains two scales. The scale  value represents the distance from the center of the radar display to  Understanding the Radar Display the outermo
                    
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                        b asIc o PtIera on > r adar Page Radar Page With the radar properly installed, when you turn on your Garmin  Marine Network chartplotter, it should detect the radar as a new  network connection.   NOTE: A software update may be needed for the radar to  function properly. If the message “Incompatible Software  Version” appears when you turn on your chartplotter, you must  update your chartplotter software. A software update card is  provided with the GMR 21/41. When the new radar is detected, the
                    
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                        b asIc o PItera on > r adar Page 2.	 Usingthe 	 	 ROCKER, highlight the function you want to add or 2. Press up or down on the ROCKERto 	 highlight 	 the 	 	option	you	 remove,and 	 press 	 	 ENTER. Only functions with a check mark want to change, and then press ENTER. in	the	check	boxnext 	 	tothem 	 appear 	 on 	 the 	 	Radar	Page. To change a Radar adjustment menu setting: 1.	 Selectan 	 	adjustmentmenu 	 option 	 	usingthe 	 method 	 described 	 	 Using the Radar Adjustment Menu previously. 
                    
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                        b asIc o PItera on > r adar Page appears. To view different areas at the selected zoom range, open the  Gain Radar adjustment menu, highlight Zoom, and press the Move soft  Gain controls the sensitivity of the Radar receiver. Auto (default) is  the recommended setting. It automatically adjusts the gain for each key. Use the ROCKER to move the selection box. Zoom has four  range scale to provide optimal performance. You can also set gain settings: Off, 2x, 4x, and Move.  manually. To see more det
                    
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                        b asIc o PItera on > r adar Page Guard Zone A Guard Zone is a user-defined area of protection. If a target enters  the Guard Zone, an alarm sounds. You can define two Guard Zones.  The Guard Zone Menu has two areas, “Guard Zone 1” and “Guard  Zone 2.” Each area has two settings, Show (Hide) and Adjust.  Target Expansion Off Target Expansion On Trails Trails allows you to select whether all returns on the screen leave a  history trail, and allows you to determine the length of the history  trail 
                    
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                        b asIc o PItera on > r adar Page 3.	 Usingthe 	 	 ROCKER, define the area on the Radar Page by  To enable VRM/EBL 1 or VRM/EBL 2: adjusting	three	points:	 Corner 1,	 Corner 2,	and	 Circular. 	 On	the	Radar	adjustment	menu,	highlight	 Show	 VRM/EBL 1  or	 VRM/EBL 2,	and	thenpress 	 	 ENTER. 4.	 Press	 ENTER	to	setthe 	 Guard 	 Zone. 	 You can adjust the diameter of the VRM and the angle of the EBL. VRM/EBL The Variable Range Marker (VRM) and Electronic Bearing Line  To adjust the VRM/EBL: (EBL) t
                    
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                        b asIc o PtIera on > r adar Page For each target, a number and Vector Line is shown with the symbol.  MARPA The number is the MARPA list ID number. The Vector Line is a  The Mini Automatic Radar Plotting Aid (MARPA) function helps  with collision avoidance. MARPA can track up to 10 designated visual reference of the target’s course and speed.  targets. Detailed information including bearing, range, course, speed,  To designate a MARPA target: closest point of approach (CPA), and time to closest 
                    
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                        b asIc o PItera on > MaP Page r adar o verla Y To view the MARPA List: Map Page Radar Overlay 	 Press	the	 MARPA List	softkey 	 . Radar information can be shown as an overlay on the Map Page.  When you overlay radar information on the Map Page, press   ADJ/MENu to access radar options.   NOTE: Changing the map scale does not change the radar range.  When you zoom in or our on the Map Page, the radar overlay is  scaled to fit. Enter Standby (Begin Transmitting) The Enter Standby (Begin Transmitti
                    
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                        b asIc o PItera on > r adar t ab General Sub Tab Radar Tab Use the General sub tab to select orientation, timed transmit, and  When GMR 21/41 is connected to a Garmin Marine Network  cross-talk rejection. The available General sub tab options are: chartplotter, and either the Auto-Detect Services or Radar check  box is selected on the System tab, the Radar tab appears on the Main  • Orientation—sets the orientation of the Radar Page display.  Menu. The settings are Heading up , North up , or Cou
                    
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                        b asIc o PtIera on > r adar t ab • Cross-talk Rejection—toggles cross-talk rejection on or off. • Navigation Features—allows you to show or hide  Radar cross-talk may occur when two or more radar equipped navigational features on the Radar Page. Use the ROCKER  vessels are operating in proximity to one another. Cross-talk and the ENTER key to select or clear options. rejection automatically filters out the cross-talk interference.  • Waypoints—show user waypoints on the Radar Page.   •  Bearing 
                    
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                        b asIc o PItera on > r adar t ab • Own Vessel Safe Zone—is a circular area defined by a range  MARPA Sub Tab setting that is centered on your own vessel. If a target enters the  The MARPA sub tab contains settings for Vector Length, Target  defined area an alarm is sounded. The Safe Zone can be set to a  History, Own Vessel Safe Zone, Tine To Safe Zone, Safe Ring Zone,  distance between .01 and 2 nautical miles. and Velocity Reference. • Time To Safe Zone—sounds an alarm if MARPA determines  tha
                    
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                        b asIc o PItera on > r adar t ab Advanced Sub Tab To manually adjust the scanner frequency: 1.	 Highlightthe 	 	 AFC Mode field, and press ENTER. Use the Advanced sub tab to set the AFC Mode and the front of boat  offset. 2.	 SelectManual, 	 and 	 	press	 ENTER. 3.	 Highlightthe 	 	 Freq	button	to	the	right	of	the	 AFC Mode field,  and	press	 ENTER.  NOTE: The Freq button is available only available if Manual is  selected in the AFC Mode field. 4. Press up or down on the ROCKER	to	adjust	thescan
                    
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                        a PPendIx > s PecIIf Itca ons Antenna RPMs: 24 rpm a ppendIx Range Ring Accuracy: 20 meters or +/- 1.5% of range scale,  Specifications whichever is greater unit Dimensions:  24" D x 8" H (610 mm x 205 mm)   Bearing Accuracy: 1 degree Cable Length: 15 meters Minimum Range: 20 meters Radar Scanner Weight: Unit 26 lbs; cable 8.35 lbs Range Discrimination: 20 meters Range Scales (Range Rings)  Sensitivity and Tune Controls:  Gain, Sea Clutter, Rain Clutter,  GMR 21—1/8 nm (1/32 nm) to 24 nm (6 nm)