Appendix D Ais Overview - Raymarine AIS700 Installation Instructions Manual

PGN Description
129794 AIS class A static and
voyage related data
129795 AIS addressed binary
message
129796 AIS Acknowledge
129797 AIS binary broadcast
message
129798 AIS SAR aircraft
position report
129801 AIS addressed SRM
129802 AIS safety broadcast
binary message
129809 AIS class B CS static
data report part A
129810 AIS class B CS static
data report part B
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Appendix D AIS overview

Tran- Re-
smit ceive
Your AIS700 uses digital radio signals to exchange
•
'real-time' information between vessels, shore based
stations, or aids to navigation (AToNs) on dedicated
VHF frequencies. This information is used to identify
•
and track vessels in the surrounding area and to provide
fast, automatic and accurate collision avoidance data.
•
Although AIS augments your Radar app by operating
in Radar blind spots and detecting smaller AIS-fitted
•
vessels, it does not replace your Radar, as it relies on
receiving transmitted AIS information and therefore
cannot detect objects such as landmasses, navigational
•
beacons or vessels not equipped with AIS.
Note:
•
NEVER assume that AIS is displaying information
•
from all vessels in the area, because:
• Not all vessels are fitted with AIS
•
• Although it is mandatory for larger commercial
vessels to carry AIS, it is not mandatory to use it.
•
AIS should be used only to augment Radar
information, not substitute it.
AIS limitation
Never assume that your AIS is detecting all vessels in
the area. Always exercise due prudence and do not use
AIS as a substitute for sound navigational judgement.
Classes of AIS
Class A transceivers
Class A AIS transceivers transmit and receive AIS
signals. AIS transceivers are currently mandatory on
all commercial vessels exceeding 300 tons that travel
internationally (SOLAS vessels).
The following information can be transmitted by a Class
A AIS system:
• Static data (Includes information such as MMSI
number, vessel name, vessel type, call sign, IMO
number, length, beam and GNSS antenna location).
• Voyage related data (Includes information such as
draft, cargo, destination, ETA and other relevant
information).
• Dynamic data (Includes information such as time
(UTC), ship's position, COG, SOG, heading, rate of turn
and navigational status).
• Dynamic reports (Ship's speed and status).
• Messages (Alarms and safety messages).
Remember that not all vessels will transmit all of the
information.
Class B transceivers
Class B AIS transceivers transmit and receive AIS
signals, but use a reduced set of data compared to Class
Data Summary
A (see ). A Class B AIS transceiver can be
fitted on any vessel not fitted with a Class A transceiver,
but is not mandatory aboard any vessel.
Data Summary
Trans-
Receiver ceiver
Data (receive) (transmit)
Ship's Yes Yes
name
Type Yes Yes
Call sign Yes Yes
IMO Yes No
number
Length Yes Yes
and beam
Antenna Yes Yes
location
Draft Yes No
Cargo In- Yes Yes
formation
Trans-
ceiver (re-
ceive)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes