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manual abstract
The scanner is automatically powered on with the MFD. The Welcome Page appears showing the GMR 21 or GMR 41 as a detected network connection. 2. Press ENTER when I Agree turns yellow, then press PAGE until the Radar Page appears. 3. During Standby mode, a countdown appears on the Radar Page and the status bar as the scanner prepares to operate. 4. With the scanner Ready, press and hold the FCTN key until Do you want to begin radar transmission? appears. 5. When safe (personnel are clear of the radar beam path), highlight Yes, and press ENTER. The scanner spins up and becomes operational. Bearing Offset It may be necessary to adjust the bearing of the radar picture shown on the screen. First, using a magnetic compass, take an optical bearing of a stationary target located within viewable range. Measure the target bearing on the radar. If the bearing deviation is more than +/- 1°, then do the following to correct for the offset: 1. From the Radar Page, press the ADJ key to display the Adjustment Menu. 2. From the Adjustment Menu, select Setup, and press ENTER. Using the ROCKER, select the Advanced tab. 3. Using the Rocker, highlight the Front of Boat Offset slider, and press ENTER. 4. Press Left on the Rocker to adjust to a negative value, or press Right to adjust to a positive value. The preview window changes as you adjust the slider. 5. Once an offset has been determined, press ENTER to save, then press QUIT to return to the Radar Page. Your new Garmin marine radar is now ready to use! Refer to the GMR 21/41 Owner’s Manual for details about operating the scanner. GMR 21/41 Marine Radar Installation Instructions SpecificationsUnit Dimensions: 24” (610 mm) D x 8” (205 mm) H Radar Scanner Weight: Unit 26 lbs; cable 8.35 lbs Range Scales (Range Rings): GMR 41 — 1/8 nm (1/32 nm) to 36 nm (9 nm) GMR 21 — 1/8 nm (1/32 nm) to 24 nm (6 nm) Power Output: GMR 21: 2 kW / GMR 41: 4 kW Power Input Source: 10-35 VDC 28 W Operating Temperature Range: -25° C to 70° C, and a relative humidity up to 95% at 35°C Beamwidth: Horizontal beamwidth of 3.6° nominal / Vertical beamwidth of 25° nominal Range: GMR 21: 24 nm / GMR 41: 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, and Frequency Tune Radar/Chart Synchronization: Overlay mode. Split overlay with standard radar presentation. Off Center Function: Look ahead, Auto Shift, and Manual RF Transmit Frequency: 9410 ± 30 MHz GMR 21/41 Marine Radar Installation Instructions GMR 21/41 Marine Radar Installation Instructions 7 Towards Bow (202.0 mm) 7.95" (610.0 mm) 24.02 (233.0 mm) 9.17" (163.5 mm) 6.44" (141.5 mm) 5.57" (304.7 mm) 12.00" Warnings and Cautions CAUTION: Use the GMR 21/41 at your own risk. To reduce the risk of unsafe operation, carefully review and understand all aspects of this Installation Manual, and thoroughly practice operation using the simulator mode prior to actual use. When in actual use, carefully compare indications from the GMR 21/41 to all available navigation sources, including the information from other NAVAIDs, visual sightings, charts, etc. For safety, always resolve any discrepancies before continuing navigation. CAUTION: IT IS THE USER’S RESPONSIBILITY TO USE THIS PRODUCT PRUDENTLY. THIS PRODUCT IS INTENDED TO BE USED ONLY AS A NAVIGATIONAL AID AND MUST NOT BE USED FOR ANY PURPOSE REQUIRING PRECISE MEASUREMENT OF DIRECTION, DISTANCE, LOCATION, OR TOPOGRAPHY. WARNING: The radar scanner transmits electromagnetic energy. Ensure that the scanner has been installed according to the recommendations given in this guide, and that all personnel are clear of the scanner before switching to transmit mode. WARNING: This product, its packaging, and its components contain chemicals known to the State of California to cause cancer, birth defects, or reproductive harm. This Notice is being provided in accordance with California’s Proposition 65. If you have any questions or would like additional information, please refer to our Web site at FCC Compliance The GMR 21/41 complies with Part 80 of the FCC rules. It has received a grant of equipment authorization, issued under the authority of the FCC. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the 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 equipmen...