Standard AIS header for all AIS binary broadcast messages AIS message number. Must be 8 8 Indicated how many times a message has been repeated 0 default do not repeat any more 1 Unique ship identification number (MMSI) 1193046 Reserved for definition by a regional authority. 0 Generic representation of position on the WGS84 sphereoid East West location 181 degrees 600000 5 -122.16328055555556 North South location 91 degrees 600000 5 37.424458333333334 UTC Time stamp - more than just msg 4? year 1-9999 0 2 month 1..12 0 2 day of the month 1..31 0 28 UTC hours 0..23 24 23 minutes 60 45 seconds 60 54 Sycronization state UTC direct UTC indirect synchronized to a base station synchronized to another station 2 Frames remaining until a new slot is selected frames Last frame in this slot 1 frames left 2 frames left 3 frames left 4 frames left 5 frames left 6 frames left 7 frames left 0 In what slot will the next transmission occur. BROKEN slottimeout0 1221 These bits not defined in the specification. slottimeout1 0 UTC time minutes field slottimeout1 minutes UTC time hour field slottimeout1 hours Slot number used for this transmission slottimeout2 4 6 numstations Number of other stations currently receiving slottimeout3 5 7 Generic representation of position on the WGS84 sphereoid. Smaller number of bits. Used by SLS and IMO binary messages East West location 181 degrees 60000 4 -122.16328 North South location 91 degrees 60000 4 37.42446