VRM/EBL The VRM/EBL feature can
be used to assess how far
away a Radar target is and
its bearing.
Refer to
16.15 Distances,
range, and bearing
for details.
Radar
application
Trails
Trails (also known as wakes)
show a history of the targets
position over a specied time
period.
Refer to
16.13 Trails for
details.
Radar
application
16.9 MARPA overview
MARPA (Mini Automatic Radar Plotting Aid)
improves collision awareness by tracking acquired
targets and calculating their speed and course to
enable risk analysis.
Pre-requisites:
• For effective MARPA operation, your MFD must
have accurate heading and speed data for your
vessel.
• In True Motion mode, Speed Over Ground (SOG)
and Course Over Ground (COG) information is
required to show true target course and speed.
• In Relative Motion mode, heading and speed
information is required.
Item Target symbol Description
1 Acquired target
2 Dangerous target
3 Target begin acquiring
4 Lost target
Each target can be displayed with a graphic
indicating the Closest Point of Approach (CPA), and
Time to Closest Point of Approach (TCPA). The
calculated target data can also be displayed. Each
target is continually assessed and an audible alarm
is sounded if a target becomes dangerous, or is lost.
The number of targets that you can track at any one
time is dependent on the type of Radar that you are
using:
• Quantum
™
= 10
• SuperHD
™
Open Array = 25
• HD Open Array = 25
• HD Radome = 25
• Non-HD Digital Radome = 10
Radar application
253
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