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E-Series Networked Display Reference Manual
Setting up MARPA
You can customize the following parameters from the MARPA Options menu:
To open the MARPA Options menu
1. Press the
TARGET TRACKING
softkey.
2. Press the
MARPA & AIS OPTIONS
softkey.
3. Change MARPA options as required.
Safety notices
MARPA can improve collision avoidance when used wisely. It is the User’s
responsibility to exercise common prudence and navigational judgements.
There are certain conditions under which acquiring a target may become difficult.
Some of those conditions are:
• The target echo is weak.
• The target is very close to land, buoys or other large targets.
• The target or your own ship is making rapid manoeuvres.
• Choppy sea state conditions exist and the target is buried in excessive sea clutter or
in deep swells.
Parameter
Options
Vector Length
The time period specified for drawing
length of vectors.
0.5min, 1 min,
3 min,
6min
,
12min, 30 min, 60 min
Target History
Plots a target’s previous position at the
specified intervals. The four most recent
position points are displayed. If True
target vectors are selected, the four
most recent vessel position points are
also displayed.
OFF
, 0.5 min, 1 min, 3 min, 6
min
Own vessel safe zone
The safe zone is a ring, centred on your
boat, within which a target is consid-
ered dangerous if it will enter this zone
within the
time to safe zone
period.
0.1 nm, 0.2nm,
0.5nm
, 1.0 nm,
2.0nm
Time to safe zone
If a target is predicted to enter your safe
zone within this time period, it is consid-
ered dangerous.
3 mins
, 6 mins, 12 mins, 24
mins
Safe zone ring
Controls whether the safe zone ring is
displayed or hidden on screen
Visible
Hidden
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