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Class B systems
Ships Dynamic Conditions
SOTMDA – 0 to 2 knots
SOTMDA – 2 to 14 knots
SOTMDA – 14 to 23 knots
SOTMDA – Greater than 23 knots
CSTMDA – 0 to 2 knots
CSTMDA – Greater than 2 knots
Other AIS sources
Source
Search and Rescue (SAR) aircraft
Aids to navigation (AToN)
AIS base station
Reporting rate (nominal)
3 Minutes
30 Seconds
15 Seconds
5 Seconds
3 Minutes
30 Seconds
Reporting rate
10 Seconds
3 Minutes
10 Seconds or 3.33 Seconds, depending on
operating parameters
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