Base station report
| Name | NumberOfBits | ArrayLength | Type | Units | Description |
|---|---|---|---|---|---|
| MessageID | 6 | uint | AIS message number. Must be 4 | ||
| RepeatIndicator | 2 | uint | Indicated how many times a message has been repeated 0: default 3: do not repeat any more |
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| UserID | 30 | uint | Unique ship identification number (MMSI) | ||
| Time_year | 14 | uint | Current time stamp year 1-9999 | ||
| Time_month | 4 | uint | Current time stamp month 1..12 | ||
| Time_day | 5 | uint | Current time stamp day of the month 1..31 | ||
| Time_hour | 5 | uint | Current time stamp UTC hours 0..23 | ||
| Time_min | 6 | uint | Current time stamp minutes | ||
| Time_sec | 6 | uint | Current time stamp seconds | ||
| PositionAccuracy | 1 | uint | Accuracy of positioning fixes 0: low (greater than 10 m) 1: high (less than 10 m) |
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| Position_longitude | 28 | decimal | degrees | Location of base station East West location | |
| Position_latitude | 27 | decimal | degrees | Location of base station North South location | |
| fixtype | 4 | uint | Method used for positioning 0: undefined 1: GPS 2: GLONASS 3: combined GPS/GLONASS 4: Loran-C 5: Chayka 6: integrated navigation system 7: surveyed |
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| Spare | 10 | uint | Not used. Should be set to zero. | ||
| RAIM | 1 | bool | Receiver autonomous integrity monitoring flag False: not in use True: in use |
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| state_syncstate | 2 | uint | Communications State - SOTDMA
Sycronization state 0: UTC direct 1: UTC indirect 2: synchronized to a base station 3: synchronized to another station |
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| state_slottimeout | 3 | uint | frames | Communications State - SOTDMA
Frames remaining until a new slot is selected 0: Last frame in this slot 1: 1 frames left 2: 2 frames left 3: 3 frames left 4: 4 frames left 5: 5 frames left 6: 6 frames left 7: 7 frames left |
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| state_slotoffset | 14 | uint | Communications State - SOTDMA In what slot will the next transmission occur. BROKEN |