User's Manual Part 2

REL
RELative
or
TRUe
Operator Manual
2−90
3748DOC020102 Edition: 14.JAN.2005
2.4.8 Potential collision points (PCP) and closest point of approach
(CPA) symbols
PCP and CPA symbols are a useful tool that assists the user in identifying
possible collision danger.
The function allows the potential collision point (PCP) or the closest point of
approach (CPA) for acquired targets to be indicated by a circular symbol in the
radar video.
The relevant function, PCP (potential collision points) or CPA (closest points of
approach), is determined by the setting of TRUE or RELATIVE.
TRUE allows the PCPs for all acquired targets to be displayed in the radar video.
RELATIVE allows the CPAs for all acquired targets to be displayed in the radar video.
Both types of display support prompt assessment of close range situations.
TRUE − Potential Collision Points (PCP) −
Potential collision points (PCP) provide a rapid overview of current and potential
collision danger (see Figure: 2−51).
Assessment:
− There is a current collision danger if a PCP lies on your own
ship’s head up line.
− There is a potential collision danger if your own ship changes
its current course such that a PCP that did not previously lie on the ship’s
head up line will now lie on that line.
Potential collision points are calculated by target acquisition.
Every target is normally marked with a PCP, which appears as a small circle.
Under certain circumstances, it is possible that a target is marked by 2 PCPs.
In such a situation, both PCPs are applicable and must be taken into account
when viewing the radar image.