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98 User Manual
5.7 AIS MENU
AIS is an Automatic Identification System. It has been introduced to improve the
safety of navigation by assisting in the efficient operation of ship-to ship, ship reporting
and VTS applications. The system should enable operators to obtain information from the
ship automatically, requiring a minimum of involvement of ship’s personnel, and should
have a high level of availability. AIS transponders installed on IMO vessels use VHF
frequencies to:
Transmit details of their own vessel
Receive details from other vessels or navigation aids within VHF range.
Information being transmitted from vessels over 300 tons that, due to recent
worldwide legislation, are required to fit Class “AAIS transponders.
Connecting to the chart plotter an AIS receiver (please contact your local dealer),
vessels with AIS transponder within VHF range are displayed on screen giving the skipper
or navigator a visual interpretation of the data of nearby vessels. This improves safety, and
specifically for collision avoidance reasons.
5.7.1 AIS SYSTEM DEFINITIONS
Target
It is a vessel equipped with AIS. Information about the targets is being received by
AIS Receiver and displayed on the screen.
CPA
Closest Point of Approach is the closest distance that will be achieved between your
vessel and the tracked target, based on your vessel’s speed and direction and the
target’s speed and direction.
CPA Limit
This is the distance from your vessel that a target may reach before a target is deemed
a threat.
CPA Alarm
Occurs if CPA is less or equal to CPA Limit. This test is done for active targets only.
TCPA
Time to closest Point of Approach is the time remaining until the CPA will occur.
TCPA Limit
This is the time remaining before the CPA is reached.
TCPA Alarm
Occurs if TCPA is less or equal to TCPA Limit. This test is done for active targets
only and if CPA value is less or equal to CPA Limit.
96


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