Garmin GPSMAP 3206 Owner's Manual page 103

To adjust the VRM/EBL:
1. Highlight Adjust and press ENTER.
2. Press right or left on the ROCKER to rotate the EBL around the center
point of the VRM.
3. Press up or down on the ROCKER to increase or decrease the size of the
VMR.
4. Press ENTER to accept the changes.
To move the center location of the VRM:
1. Highlight Move, and press ENTER.
2. Using the ROCKER, move the center point of the VRM to the selected
location.
3. Press ENTER to set the new location.
To use the VRM/EBL, expand the diameter of the VRM so that the outer edge
touches the target. Rotate the EBL until it intersects the VRM at the target
location. The measured range and bearing are displayed in the lower-left corner of
the screen.
MARPA
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 has been tested using the KVH
heading sensor using six second dampening.
GPSMAP 3206/3210 Owner's Manual
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.
To designate a MARPA target:
1. Use the ROCKER to move the pointer to the target location.
2. Press the Acquire Target soft key.
While a target is being designated, a red box appears around the target. When
MARPA begins tracking the target, the box is replaced with the appropriate
symbol.
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Target s dangerous
Lost target
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