Powering on the System

Once successfully installed the scanner is ready to be powered on.

1.On the MFD (Multi-Function Display), press the red Power button. This will automatically power on the scanner. The Welcome Page appears showing the GMR 20 or 40 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 on the top status bar) counting down as the scanner prepares to operate.

4.Once ready, hold FCTN until “Do you want to begin radar transmission?” appears and release.

5.When safe to do so (personnel clear of radar beam path), highlight ‘Yes’ and press ENTER. The scanner spins up and is now operating.

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.

3.Using the ARROW KEYPAD, highlight the ‘Front of Boat Offset’ slider and press ENTER.

4.Press Left on the ARROW KEYPAD to adjust to a negative value or press Right to adjust to a positive value. The preview window below changes as you adjust the slider.

5.Once an offset has been determined, press ENTER to save and press QUIT to return back to the Radar Page. Your new Garmin Marine radar is now ready to use! Refer to the GMR 20/40 Owner’s manual (190-00457-00) for details on operating the scanner.

GMR 20/40 Radar Installation Manual

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