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GMR 20/40 Owner’s Manual 1
GMR 20/40 OPERATION
Radar Overview
The Garmin GMR 20/40 Radar Scanner transmits a narrow beam of
microwave energy in a rotating 360° pattern. When the transmitted
energy contacts a target, some of that energy is reflected and returned
to the scanner. The scanner collects the returned energy for processing
and display. The GMR 20/40 is operated and adjusted using the
controls on your Gamin chartplotter. Radar data is presented on a
dedicated Radar page, or as an overlay on the Map page. All radar
controls are accessible on both pages.
The Radar Page
With the GMR 20/40 Radar properly installed, at power up, the
Garmin chartplotter should detect the GMR 20/40 as a new network
connection.
Note: A software update may be needed for the GMR 20/40
to function properly. If the message “Incompatible Software
Version” is displayed when the chartplotter is powered on, the
software in the chartplotter needs to be updated. A software
update card is provided with the GMR 20/40.
When the new radar is detected, the chartplotter automatically adds
a dedicated Radar page to the page list. If the Radar page is not
available, press and hold the ADJ/MENU key until the Main Menu is
displayed. Using the ARROW KEYPAD, highlight the System tab,
and select Radar from the Services list at the bottom of the page.
To Select the Radar page for display:
1. Press the PAGE key to display the Pages list.
2. Using the ARROW KEYPAD, select Radar.
3. Press the ENTER key.
Pages List
GMR 20/40 OPERATION > RADAR OVERVIEW—THE RADAR PAGE