Display Of Vectors - JRC JMA-993-SA Instruction Manual

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5.5
ARPA DATA DISPLAY
(Refer to the Display Example on page 2-1.)
Display of Vectors
Aftention
o When a targeting or the own ship changes course or when a larget is acquired,
the vector may not reach a given level of accuracy until three minutes or more has
passed after such a course change or target acquisition.
Even if three minutes or more have passed, lhe vector may include an error
depending upon the tracking conditions.
A veclor representing a target's predicted position can be presented in the TRUE vector or RELATIVE
vector mode. In each mode, a vector length can be freely changed for a time int€rval of 1 to 60
minutes.
lU Vector Mode Selection
True Vector Mode
In the true vector mode, the direction of a target vector indicates the true course of lhe
target and its veclor length is proportional to its speed.
In this mode, the own ship's vector is displayed as shown below.
In this mode, the movements of other ships around own ship can be accurately and easily
monitored. However, no CPA RING can be displayed in this mode.
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Own ship's vector
The relative vector is not displayed.