Sperry Marine Visionmaster FT ECDIS, Руководство пользователя

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ECDIS User Guide Targets
65900012 10-55
PADs
Predicted Areas of Danger (PAD) is an optional feature where outlines are
drawn on the chart display to mark an area that needs to
be avoided in order to prevent a CPA violation to own ship
by an established tracked target or active AIS target.
The size and location of a PAD depends on own ship's
CPA limit (see Limits and Settings) and speed, plus the
target's position course and speed. For information on
accessing data on targets refer to Selected Target.
The boundary of a PAD associated with a target is drawn
such that, if ownship were to change its course to move
toward any given point on the boundary and the target
were to continue with its current velocity, the target would
be at the CPA limit when own ship reaches the PAD boundary.
PADs are only displayed for a target when the system can calculate the
CPA of that target. If the CPA limit is changed, the shapes of PADs adjust
accordingly. If own ship's CCRP crosses over a PAD boundary, the display
of the PAD is disabled until the CCRP is no longer within its boundaries.
To select display options for PADs do the following.
1. Open the PAD sub menu. The window
displays the current CPA limit for targets to
own ship and enables the following display
options to be selected:
•
Predicted Areas of Danger (PADs)
•
Predicted Points of Collision (PPCs)
•
Intercept Lines
2. To change a target's CPA limit click the
Target Limits and Settings button, the
Limits and Settings opens from where you can adjust the CPA limit.
If all three display options have selected from the PAD menu the video
circle chart display will display the following features additional to the PAD
(see the figure below):
•
PPCs - these are located within the boundaries of its associated
PAD and are shown as a round dot marked on the target’s course
vector where own ship's CCRP may intercept the target.
•
Intercept Lines - these are lines that connect ownship's CCRP to
the PPC. This line represents the course of ownship, based on
present speed, to intercept with the target at the PPC.