Base station report F S 1 AS FATDMA RATDMA ITDMA SOTDMA BASE AIS message number. Must be 4 11 Indicated how many times a message has been repeated 0 default do not repeat any more 1 Unique ship identification number (MMSI) 1193046 Current time stamp Accuracy of positioning fixes low (greater than 10 m) high (less than 10 m) 1 Location of base station Method used for positioning 0 undefined GPS GLONASS combined GPS/GLONASS Loran-C Chayka integrated navigation system surveyed 1 Not used. Should be set to zero. 0 Receiver autonomous integrity monitoring flag not in use in use 0 FIX: broken 2 Communications State - SOTDMA