User's Manual

12
AIS Transmit Rate
P200-CS (CSTDMA Class B AIS) broadcasts ship dynamic data per following reporting
interval. Besides, ship static data will be broadcasted every 6 minutes.
Ship Condition
Nominal Reporting Interval
Ship not moving faster than 2 knots
3 minutes
Ship moving faster than 2 knots
30 seconds
P200-SO (SOTDMA Class B AIS) also broadcasts ship´s static data every 6 minutes. Yet,
its ship dynamic data will be transmitted per following reporting interval:
Ship Speed
Nominal Reporting Interval
Increased Reporting Interval
>23 knots
Every 5 seconds
Every 15 seconds
between 14-23 knots
Every 15 seconds
Every 30 seconds
between 2-14 knots
Every 30 seconds
Every 30 seconds
≤ 2 knots or at anchored
or moored
Every 3 minutes
Every 3 minutes
The Class B “SO” AIS follows the rules set by ITU-R M.1371-5, and increases the
reporting interval to “Increased Reporting Interval” in accordance with Table above
when less than 50 % of the AIS-signal-slots of each of the last four consecutive frames
are free. When more than 65 % of the slots of each of the last four consecutive frames
are free, the Class B “SO” AIS reports at the “Nominal Reporting Interval”.