Bedienungsanleitung Standard Horizon CP590 - GPS Chart Plotter (Seite 94 von 121) (Englisch)

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Page 96 CP590

14. 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 location 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.

CP590 is able to display AIS Target (for collision avoidance) on the Chart page and AIS list

pages when connected to a AIS Receiver (GX2100 or GX2150 STANDARD HORIZON

VHF/AIS transceiver) or transponders which output NMEA-0183 VDM sentence at 38400

or 4800 baud. The CP590 is able to show targets from both Class A (commercial) and Class

B targets.

14.0 SYSTEM DEFINITIONS

· Target: vessel equipped with AIS. Information about the Targets is being received by

AIS Receiver and displayed on the screen.

· CPA (Closest Point of Approach): 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: 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): time remaining until the CPA will occur.

· TCPA Limit: 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) number: a unique 9 digit number that is

assigned to a DSC radio station. It primarily registers the boat information in the U.S.

Coast Guard’s national distress database for use in emergency situations.

· Active Target: Target located within the Activation Range. Active Targets are

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 Targets are

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

· Sleeping Target: Target located outside the Activation Range. Sleeping Targets are

represented by a small oriented triangle.

· Lost Target: when the AIS info is not received from that vessel for 3.5 minutes. The

presentation will be a flashing black triangle with a cross through.

· Activation Range: range around your boat where Targets become active. AIS Targets

become active within this range. Activation Range should be greater than CPA Limit

by definition.

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