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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)
