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144 C-Series Display Reference Manual
How is a risk assessed?
Each target is monitored to see if it will be within a certain distance from your boat
within a certain time. If so, the target is designated as dangerous and an audible
warning is sounded along with an on-screen warning being shown. The target symbol
changes to the dangerous target symbol and flashes to indicate that it is a dangerous
target. Pressing the appropriate soft key will silence the alarm and remove the
warning.
If a target is lost, either because the MARPA software has lost contact with it, or
because it has moved out of range, an audible alarm is sounded and an on-screen
warning appears. The on-screen symbol will change to the target lost symbol. Pressing
the appropriate soft key will silence the alarm and remove the on-screen warning and
the target lost symbol.
How far from my boat does MARPA work?
MARPA target acquisition is only available at radar range scales of up to 12nm,
although tracking continues at all ranges.
If you change to a smaller range scale, targets may be beyond the range of your
scanner and will be lost. In such cases, an on-screen warning will indicate that the
target is off-screen.
What happens to target data?
All MARPA targets are stored in a MARPA database list which shows the following
information:
Target display
Each target is displayed as a symbol which indicates its status:
D6811_2
MARPA LIST...
TARGET
TRACKING
ID Bearing Range
True
Course
True
Speed
CPA TCPA
022
o
T
025
o
T
0.000nm
0.000nm
180
o
T
180
o
T
0.0kts
0.0kts
0.000nm
0.000nm
00h00m00s
00h00m00s
MARPA LIST
1
2
D7542_2
Dangerous target
Safe target
Target being acquired
Lost target
81221_4.book Page 144 Tuesday, February 28, 2006 5:24 PM