Operation Manual

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5-13
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 When a targeting or the own ship changes course or when a target 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, the vector may include an erro
r
depENTing upon the tracking conditions.
5.5 ARPA DATA DISPLAY
(Refer to the Display Example on page 2-1.)
Display of Vectors･････････････････････････････････････････
A vector 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 interval of 1 to 60
minutes.
[I] Vector Mode Selection
True Vector Mode
In the true vector mode, the direction of a target vector indicates the true course of the
target and its vector 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.
Own ship’s vector
True vector
The relative vector is not displayed.
Attention