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STANDARD HORIZON VHF/AIS transceiver) or transponders which output NMEA-0183
VDM sentence at 38400/4800 baud, or output NMEA-2000 . The CPN Series Chart Plotters
are able to show Targets from both Class A (commercial) and Class B Targets.
AIS data can be received both from NMEA-0183 and NMEA-2000 relevant instruments, without any
priority. In this mode the safety will be increased.
2.15.1 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.
A Target is removed from the screen if data is not received for 10 minutes.
The maximum number of tracked Class A or B Targets is 200.
This information is updated every 3 seconds to 6 minutes depending on speed and rate of turn,
enabling the track of the vessels in range to be plotted.
Summary of Contents for CPN1010i
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Page 156: ...CPN700i and CPN1010i Multimedia Chart Plotters Page 157 ...
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