Garmin gmr 21-41 Benutzerhandbuch

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The Mini Automatic Radar Plotting Aid (MARPA) function helps 

with collision avoidance. MARPA can track up to 10 designated 

targets. Detailed information including bearing, range, course, speed, 

closest point of approach (CPA), and time to closest point of approach 

(TCPA) for each target is shown in the MARPA list.

  NOTE: MARPA  requires the use of a Heading Sensor. The 

heading sensor must output the NMEA sentence HDM or HDG 

at format 0183, v2.30 or higher. The Gamin Marine Network was 

tested using the KVH

®

 1000 heading sensor using six second 

dampening.

MARPA relies on a Heading Sensor to provide accurate own vessel 

heading information. Accurate heading data enhances MARPA’s 

performance. Each target being tracked by MARPA is represented by 

a symbol. The symbols indicate the current state of the target.

For each target, a number and Vector Line is shown with the symbol. 

The number is the MARPA list ID number. The Vector Line is a 

visual reference of the target’s course and speed. 

1.  Use the

ROCKER to move the pointer to the target location.

2.  Press the

Acquire Target soft key.

When acquiring a target, a red box appears around the target. When 

MARPA begins tracking the target, the box is replaced with the 

appropriate symbol.