Garmin GPSMAP 12X3, Owner'S Manual

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MARPA Targeting Symbols
Acquiring a target. Concentric, dashed green rings radiate from the target while the radar is locking
onto it.
Target has been acquired. A solid green ring indicates the location of a target that the radar has
locked onto. A dashed green line attached to the circle indicates the projected course over ground or
the GPS heading of the target.
Dangerous target is in range. A red ring flashes from the target while an alarm sounds and a message
banner appears. After the alarm has been acknowledged, a solid red dot with a dashed red line
attached to it indicates the location and the projected course over ground or the GPS heading of the
target. If the safe-zone collision alarm has been set to Off, the target flashes, but the audible alarm
does not sound and the alarm banner does not appear.
Target has been lost. A solid green ring with an X through it indicates that the radar could not lock
onto the target.
Closest point of approach and time to closest point of approach to a dangerous target.
Acquiring MARPA Targets Automatically
You can acquire MARPA targets automatically based on MotionScope, guard zones, or boundaries.
1 From a radar screen, select Options > Layers > Other Vessels > MARPA > Auto Acquire.
2 Select , and adjust additional settings (optional).
Removing MARPA Targets Automatically
You can enable the MARPA Auto Remove setting to remove lost targets from the target list automatically. While
enabled, lost targets are removed when new targets are acquired while the target list is at full capacity.
1 From a radar screen, select Options > Layers > Other Vessels > MARPA.
2 Select Auto Remove > On.
Assigning a MARPA Tag to an Object
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.
1 From a radar screen, select an object or location.
2 Select Acquire Tgt. > MARPA Target.
Removing a MARPA Tag from a Targeted Object
1 From the Radar screen, select a MARPA target.
2 Select MARPA Target > Remove.
Viewing Information about a MARPA-tagged Object
You can view the range, bearing, speed, and other information about a MARPA-tagged object.
1 From a radar screen, select a targeted object.
2 Select MARPA Target.
Viewing a List of AIS Threats
1 Select Info > Other Vessels > AIS List.
2 If necessary, select Display Options to sort or filter the items in the list.
98 Radar