Manual Interphase CHART MASTER V6 (page 44 of 89) (English)

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46 User Manual

4.8 AIS

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 “A” AIS 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.

4.8.1 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 be-

tween 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.

♦ Radio Call Sign

International call sign assigned to vessel, often used on voice radio.

♦ Name

Name of ship, 20 characters.

♦ MMSI

Maritime Mobile Service Identity.

♦ MMSI number

A unique 9 digit number that is assigned to a DSC radio station. It prima-

rily registers the boat information in the U.S. Coast Guard’s national dis-

tress database for use in emergency situations.

♦ Active Target

Target located within the Activation Range. Active Target is represented by

oriented triangle with COG and Heading vectors. Rate of turn may also be

displayed.

♦ Dangerous Target

Target detected by CPA or TCPA Alarm. Dangerous Target is Active Target

by definition. For better visibility Dangerous Target symbol is flashing.

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Interphase CHART MASTER V6 Manual

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