Garmin gmr 404 用户手册

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•  Safe Zone Ring—displays a ring on the Radar Page depicting 

the Own Vessel Safe Zone.

•  Velocity Reference—has two settings, Absolute and Relative. 

This setting determines how speed and direction are displayed 

on the MARPA list. Relative calculates target speed and 

direction relative to your own. Absolute shows the target’s 

actual speed.

Use the Advanced sub tab to set AFC mode, front of boat offset and 

antenna size.

The available Advanced sub tab settings are:

•  AFC Mode—sets how the scanner frequency is adjusted. 

Select Auto to automatically adjust the scanner frequency for 

optimal performance (recommended). Select Manual to set the 

frequency manually.

1.  Highlight the

AFC Mode field, and press ENTER.

2.  Select Manual, and press

ENTER.

3.  Highlight the

Freq button to the right of the AFC Mode field, 

and press

ENTER.

  NOtE: The Freq button is available only available if Manual is 

selected in the AFC Mode field.

4.  Press up or down on the 

ROCKER to adjust the scanner

frequency.

5.  Press

ENTER to accept the frequency change.

  NOtE: The Signal Strength bar graph is damped and may be 

slow when responding to frequency tuning changes.

•  Signal Strength—Shows the strength of the radar signal
•  Front of Boat Offset—allows you to offset the front of the 

boat if you mount the radar at an angle.

•  Antenna Size—allows you to select the size of your antenna  

(4 Foot or 6 Foot). Select 4 Foot for a GMR 404 radar; select 

6 Foot for a GMR 406 radar.