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12 GMR 404/406 Owner’s Manual
bAsIc oPerAtIon > rAdAr tAb
• Rings—toggles the radar rings on or off.
•
Background—sets the background color for the Radar Page.
Available options are Black, Blue, or White.
•
Heading Line—toggles the heading line on or off.
•
Bearing Reference—sets your bearing, either Absolute or
Relative. Relative calculates the bearing relative to own vessel
heading. Absolute calculates the bearing referring to North.
•
Navigation Features—allows you to show or hide
navigational features on the Radar Page. Use the ROCKER
and the ENTER key to select or clear options.
•
Waypoints—show user waypoints on the Radar Page.
•
Bearing Line—show a bearing line on the Radar Page. The
bearing line appears as a line from your current position
to the active destination waypoint, similar to a traditional
lollipop.
•
Course Line—show a course line from your starting
point to the active destination waypoint, which is similar to
navigation on a map.
MARPA Sub Tab
The MARPA sub tab contains settings for Vector Length, Target
History, Own Vessel Safe Zone, Time To Safe Zone, Safe Ring Zone,
and Velocity Reference.
The available MARPA sub tab options are:
• Vector Length—
predicts the target’s approximate position at
a set time interval. This setting determines the length of the
Vector Line, based on the time interval setting and the target’s
speed. The time interval settings range from .05 minutes to 60
minutes.
• Target History—
is a trail showing a target’s movement. Target
History can be turned On or Off.
•
Own Vessel Safe Zone—is a circular area dened by a range
setting that is centered on your own vessel. If a target enters the
dened area an alarm is sounded. The Safe Zone can be set to a
distance between .01 and 2 nautical miles.
• Time To Safe Zone—
sounds an alarm if MARPA determines
that a target will intersect the Own Vessel Safe Zone within the
dened time interval. The time interval settings range from 3 to
24 minutes.