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146 C-Series Display Reference Manual
True mode
With the display set in True mode, the vectors of your vessel and the target are shown
extended to their intersection point. The CPA is shown as a line that is placed on your
boat’s vector at the point of the CPA. The length and direction of the line indicates the
distance and bearing of the target at CPA. The text indicates CPA and TCPA. The text
next to the target symbol indicates its true course and speed.
Relative mode
With the display set in Relative mode, no vector extension of your boat is shown. The
CPA line emerges from your own boat, with the target vector extension being shown
as relative, not true. The text next to the target indicates its course and speed. Press
SHOW DETAILS to display the calculated relative course and speed.
Setting up MARPA
You can set up the following MARPA parameters:
Parameter
Options
(Default in bold)
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 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 considered 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 enters your safe zone within this time period, it
is considered 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
D6600-2
TARGET
TRACKING...
MARPA & AIS
OPTIONS...
Select required level
MARPA OPTIONS...
Enter highlighted parameter
Highlight required parameter
TARGET HISTORY Off
OWN VESSEL SAFE ZONE 0.5nm
TIME TO SAFE ZONE 3min
SAFE ZONE RING HIDDEN
V
ECT
O
R LEN
G
TH
6
min
81221_4.book Page 146 Tuesday, February 28, 2006 5:24 PM