Search and rescue position report 72 F S 3 AU AS SOTDMA RATDMA ITDMA base mobile AIS message number. Must be 10 10 Indicated how many times a message has been repeated 0 default do not repeat any more 1 Unique ship identification number (MMSI) 1193046 Not used. Should be set to zero. 0 Unique ship identification number (MMSI) 1193046 Not used. Should be set to zero. 0