Classes Of Ais Data - Raymarine E Series User Reference Handbook

10.3 Classes of AIS data

There are 2 classes of AIS data; each class supports a different
range of AIS data.
AIS data is defined as Class A or Class B. The sending and
receiving of Class A and Class B data may not be compulsory for all
vessels. Therefore, you should NOT assume that your multifunction
display is showing all vessels in your area.
Note: Not all AIS units will decode all the available AIS
information. For example, some AIS Class B receivers do not
decode and output information such as the vessel's name, IMO
number, vessel draft / beam / length, and destination. Additionally
some Class A vessels do not input all of the required AIS data, in
which case the information will not be shown on your multifunction
display.
Your AIS receiver or transceiver may support additional AIS data
that is not shown on your multifunction display.
The following table lists the AIS information that is shown on your
multifunction display:
Class A
Data (receive)
Vessel's name
Type
Call sign
IMO number
Length and beam
152
Class B
Class B (send) (receive)
Class A
Data (receive)
Antenna location
Draft
Cargo
Information
Destination
ETA
Time
Vessel's position
COG
SOG
Gyro heading
Rate of turn
Navigational
status
Safety message
Class B
Class B (send) (receive)
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