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Data
Antenna location
Draft
Cargo
Information
Destination
ETA
Time
Ship's position
COG
Data
SOG
Gyro heading
Rate of turn
Navigational
status
Safety message
*Class B transceivers do not transmit a Gyro heading unless the transceiver is receiving an NMEA HDT
sentence from an external source.
Data reporting intervals
AIS information is classed as either static or dynamic. Static information is broadcast, when data has
been amended, or upon request, or by default, every 6 minutes.
The reporting rates for dynamic information depend on speed and course change, and are given in
the following tables.
Note: The reporting rates shown here are for reference and may not be the rate at which
information is actually received by your AIS transceiver. This is dependent on a number of factors,
including but not limited to antenna height, gain and signal interference.
Class A systems
Ships Dynamic Conditions
At
anchor
or
moored,
moving less than 3 knots
At
anchor
or
moored,
moving greater
than 3
knots
0-14 knots
14-23 knots
Faster than 23 knots
Receiver (receive)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Receiver (receive)
Yes
Yes
Yes
Yes
Yes
Reporting rate
Not changing course
3 Minutes
10 Seconds
10 Seconds
6 Seconds
2 Seconds
Transceiver
(transmit)
Yes
No
Yes
No
No
Yes
Yes
Yes
Transceiver
(transmit)
Yes
Yes*
No
No
No
Changing course
3 Minutes
10 Seconds
3 1/3 Seconds
2 Seconds
2 Seconds
Transceiver
(receive)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Transceiver
(receive)
Yes
Yes
Yes
Yes
Yes
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