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GMR 404/406 Owner’s Manual 13
bAsIc oPerAtIon > rAdAr tAb
• 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.
Advanced Sub Tab
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.
To manually adjust the scanner frequency:
1. Highlight the AFC Mode eld, and press ENTER.
2. Select Manual, and press ENTER.
3. Highlight the Freq button to the right of the AFC Mode eld,
and press ENTER.
NOTE: The Freq button is available only available if Manual is
selected in the AFC Mode eld.
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.