Garmin gmr 21-41 User Manual

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When GMR 21/41 is connected to a Garmin Marine Network 

chartplotter, and either the Auto-Detect Services or Radar check 

box is selected on the System tab, the Radar tab appears on the Main 

Menu.

1.  Press the

Setup soft key on the Radar Page to open the Main

Menu. The Radar tab is automatically selected.

2.  Highlight the setting you want to change, and then press 

ENTER.

3.  Press

QUIT to return to the Radar Page.

Use the General sub tab to select orientation, timed transmit, and 

cross-talk rejection. The available General sub tab options are:

• 

Orientation—sets the orientation of the Radar Page display. 

The settings are Heading up, North up, or Course up.

•  North Indicator—toggles the north indicator arrow on or off.
•  Timed Transmit—used to save power, usually while at anchor. 

When Timed Transmit is On, the radar uses the settings in 

Timed Transmit XMIT Time and Timed Transmit STBY 

Time fields. When set to Off, these fields are unavailable. 

•  Timed Transmit XMIT Time—sets the amount of time (in 

minutes) for which the radar transmits. If set to 01 min, the 

radar transmits for one minute before switching to standby 

for the amount of time entered in the Timed Transmit STBY 

Time field. 

•  Timed Transmit STBY Time—sets the amount of time (in 

minutes) that the radar is in Standby Mode. If set to 10 min, 

the radar is in Standby Mode for 10 minutes before switching 

to transmission for the amount of time entered in the Timed 

Transmit XMIT Time field. When the radar is in Standby 

Mode, the scanner does not rotate or transmit; however, power 

is still applied to the Magnetron, eliminating the need for a 

warm-up cycle.