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Chapter 7: Setting Up the System Defaults 7-15
MARPA Set Up
Parameters
7.5 MARPA Set Up Parameters
The MARPA set up menu provides options to specify the target vectors, safe
zone and target history display.
The following table lists the MARPA Set Up parameters and their options,
shows the factory default setting, and provides a space for you to make a note
of your new default setting. Each parameter is described in the following
subsections.
Target Vector and Predicted Position
The target vector can be True or Relative. True indicates the target’s true
course and speed over ground. If Truevectors are selected, the vessel’s vector
is also shown. A Relative vector indicates the target’s course and speed
relative to your vessel.
The length of the vector is determined by the target predicted position after a
set time interval.
Safe Zone
The safe zone options are used to set the dangerous target alarm limits.
The safe zone is a ring, centred on your vessel, within which a target is
considered dangerous. A target can also be considered dangerous when it is
within a specified time of the safe zone. You can switch the safe zone on/off.
When the zone is on and a target is acquired, the safe zone ring is displayed.
Target History
Target history can be set to plot the targets’ previous position at specified
intervals. The four most recent position points are displayed. If True target
vectors are selected, then the four most recent vessel position points are also
displayed.
Table 7-5: MARPA Set Up Parameters
Parameter Options Factory Default New Default
TARGET VECTOR TRUE
RELATIVE
RELATIVE
VECTOR LENGTH 30 SECS, 1 MIN, 3 MINS,
6MINS, 12MINS
3MINS
OWN VESSEL
SAFE ZONE
0.1 nm, 0.2 nm, 0.5 nm,
1.0 nm, 2.0 nm
0.5 nm
TIME TO SAFE
ZONE
3MINS, 6MINS,
12 MINS, 24 MINS
3MINS
SAFE ZONE RING OFF, ON ON
TARGET HISTORY OFF, 0.5 MIN, 1 MINS,
2MINS, 4MINS
OFF
81186_3.book Page 15 Thursday, August 22, 2002 8:23 AM