JRC JMR-7230-S3 Instruction Manual page 67

True vector mode
In the true vector mode, the directions of vectors indicate the true courses of targets and the Vector
Lengths indicate the values which are proportional to their speeds.
In the true vector mode, the movements of other ships around own ship can be accurately and easily
monitored.
Vectors of own ship are displayed as shown below.
Note
In true vector mode, CPA ring cannot be displayed.
Own ship's
vector
Example of True Vector Mode
Relative Vector Mode
The relative vector does not represent the true motion of the target, but its relative relation with own
ship. A target with its relative vector directed to own ship (passing through the CPA limit ring) will be a
dangerous target.
In the Relative Vector mode, it can be seen at a glance where the CPA limit of the dangerous target is.
CPA ring
Example of Relative Vector Mode
HL
True vector
The relative vector is not displayed.
The true vector is not displayed.
Relative vector
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Section 6 Target Tracking and AIS
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