Garmin GMR 21 - Manual (Page 5)

GMR 21/41 Owner’s Manual 1
GMR 21/41 O
PERATION
Radar Overview
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.
The Radar Page
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.
To Select the Radar Page for display:
1. Press PAGE to display the Pages list.
2. Using the Rocker, select Radar.
3. Press ENTER.
Pages List
GMR 21/41 O
PERATION
> R
ADAR
O
VERVIEW
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HE
R
ADAR
P
AGE