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Powering on the System
To power on the scanner:
1. On the MFD (multi-function display), press the red Power key. 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
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