JRC JMR-7230-S Instruction Manual page 130

Trial maneuvering in the relative vector mode
If the own ship's vector mode is the relative vector mode, an expected relative course of the target is
displayed in relation to the own ship's expected course when in the true vector mode. The following
figures show an example of a dangerous target changing to a safe target. The target vector will cross
the CPA ring and will thus be a dangerous target. By trial maneuver of ship avoidance simulation
(under the same condition as the true vector in the previous section), the relative vector (expected
course) of the target changes to a safe target as shown in the lower figure.
NORMAL
TRIAL
Trial Maneuvering in the Relative Vector Mode
The above figure shows that the relative vector of the target has changed as shown in the Figure as a
result of simulation (course and speed) in the previous section, so that the symbol color is changed into
"White", a safe target.
Irrespective of the simulation results, the current CPA and TCPA values are shown in the tracked target
information just like when the true vector mode is active.
The course change of own ship is displayed as a dotted-line.
Better information is provided by using the trial relative vector mode when sea stabilization mode is
active.
Section 6 Target Tracking and AIS
HL
CPA Ring
CPA Ring
HL
T
T
Dangerous target
Change of symbol
as a result of trial
maneuver
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