Marpa; Marpa Targeting Symbols; Acquiring Marpa Targets Automatically; Removing Marpa Targets Automatically - Garmin GPSMAP 9 3 Series Owner's Manual

MARPA

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.

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.
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Radar