Chapter 2
OPERATIONS
2.7
SOFT KEY OPERATION
2-31
2
INSTRUCTION MANUA
z Relative Vector Mode
The relative vector does not represent the true motion of the target, but its relative
relation with own ship. This means that 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.
The true vector is
not displayed
Relative vector
CPA ring
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Therefore, the TRUE/REL mode shall optionally be used for the purpose of observation:
the TRUE vector mode for grasping the true aspect of a target, and the REL vector mode
for grasping a target's closest point of approach (CPA).
Vector Length
The vector length of a target is proportional to its speed, and the vector time can be
switched in a range of 1 to 60 minutes.
The diagram below illustrates a vector length of a target for six minutes, and the tip of
the vector represents the target's position expected to reach six minutes later.
Current position
Future predicted position
(6 min later in this example)
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