Garmin gmr 41 User Manual

The Garmin GMR 21/41 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 21/41 is operated and adjusted using controls 

on the 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.

With the GMR 21/41 radar properly installed, at power up, the 

Garmin chartplotter should detect the GMR 21/41 as a new network 

connection. 

NOTE: A software update may be needed for the GMR 21/41 

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 21/41.

 

When the new radar is detected, the chartplotter automatically 

adds a dedicated Radar Page to the pages list. If the Radar Page is 

not available, press and hold ADJ/MENU until the Main Menu is 

displayed. Use the Rocker to highlight the System tab, and select 

Radar from the Services list at the bottom of the page.

1.  Press 

PAGE to display the Pages list. 

2.  Using the 

Rocker, select Radar.

3.  Press 

ENTER. 

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