Jeppesen Marine Workboat Navigator 1.3 - Manual (Page 116)

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Radar
Radar Target Tracking
Jeppesen Workboat Navigator has a built-in comprehensive target tracking system.
Targets can be acquired one of three ways:
AIS: Automatic Identification System is a system where boats can broadcast
position, course, speed, rate of turn and other useful information. It can be used to
educate local traffic about the traffic conditions. Boats of a certain size are required
to broadcast the AIS signals, but anyone can listen. If your boat is equipped with an
AIS receiver or transceiver, Jeppesen Workboat Navigator picks up the incoming
information and paints the targets on the chart. This type of target tracking is
described in greater detail in Chapter 9 - Using Nav Objects.
External Radar: Many external radars can acquire targets using either ARPA or
MARPA. Most of these radars can also broadcast this data to Jeppesen Workboat
Navigator using the NMEA standard sentences. When properly connected,
Jeppesen Workboat Navigator paints these targets from external radars.
ARPA/MARPA requires an additional serial connection from your computer to the
Radar.
Point and Click (MARPA): Jeppesen Workboat Navigator can be used to easily
acquire and track radar targets.
Point and Click Radar (MARPA)
MARPA is an acronym for Mini Automated Radar Plotting Aid. Its primary purpose is
for collision avoidance and target tracking.
WARNING:
No single navigational aid should be relied upon for the safety of
boat and crew. The captain has the responsibility to use all navigation aids
to verify position. Electronic navigation aids are not a substitute for basic
navigational principles and common sense.
Properly tuning and adjusting your radar in changing conditions is critical for
target tracking. MARPA target tracking requires accurate heading data. A poorly
performing heading sensor makes target tracking impossible. For best performance,
use a high speed GPS gyro compass and GPS.