Garmin GPSMAP 12X3, Owner'S Manual

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Defining a Circular Guard Zone
Before you can define the boundaries of the guard zone, you must enable a guard zone ( Enabling a Guard Zone,
page 96 ).
You can define a circular guard zone that completely surrounds your boat.
1 From a radar screen, select Options > Radar Options > Guard Zone >
.
2 Select Circle.
3 Select the location of the outer guard zone circle.
4 Select the location of the inner guard zone circle to define the width of the guard zone.
Defining a Partial Guard Zone
You can define the boundaries of a guard zone that does not completely surround your boat.
1 From a radar screen, select Options > Radar Options > Guard Zone > .
2 Drag the cursor to the location of the outer guard-zone corner .
3 Select Corner 2.
4 Drag the cursor to the location of the inner guard-zone corner to define the width of the guard zone.
5 Select Done.
MARPA
WARNING
This feature is intended to enhance situational awareness and may not prevent collisions in all circumstances.
You are responsible for the safe and prudent operation of your vessel and for remaining aware of obstacles or
hazards in or around the water. Failure to do so could result in an accident causing property damage, serious
personal injury, or death.
Mini-automatic radar plotting aid (MARPA) enables you to identify and track targets and is primarily used for
collision avoidance. To use MARPA, you assign a MARPA tag to a target. The radar system automatically tracks
the tagged object and provides you with information about the object, including the range, bearing, speed, GPS
heading, nearest approach, and time to nearest approach. MARPA indicates the status of each tagged object
(acquiring, lost, tracking, or dangerous), and the chartplotter can sound a collision alarm if the object enters your
safe zone.
Before you can use MARPA, you must have a heading sensor connected and an active GPS signal. The heading
sensor must provide the NMEA 2000 parameter group number (PGN) 127250 or the NMEA 0183 HDM or HDG
output sentence.
Radar 97