Physical link:
AIS
msg_ID:
11
Extended description:
Current UTC and date if available
Priority:
3
Access scheme:
RATDMA
ITDMA
Communication state:
SOTDMA
Transmitted by:
Mobile station
| Parameter | Number of bits | Description |
|---|---|---|
| Message ID | 6 | Identifier for this Message 4 or 11 4 = UTC and position report from base station: 11 = UTC and position response from mobile station |
| Repeat indicator | 2 | Used by the repeater to indicate how many times a message has been repeated. Refer to § 4.6.1, Annex 2; 0-3; 0 = default; 3 = do not repeat any more |
| User ID | 30 | MMSI number |
| UTC year | 14 | 1-9999; 0 = UTC year not available = default |
| UTC month | 4 | 1-12; 0 = UTC month not available = default; 13-15 not used |
| UTC day | 5 | 1-31; 0 = UTC day not available = default |
| UTC hour | 5 | 0-23; 24 = UTC hour not available = default; 25-31 not used |
| UTC minute | 6 | 0-59; 60 = UTC minute not available = default; 61-63 not used |
| UTC second | 6 | 0-59; 60 = UTC second not available = default; 61-63 not used |
| Position accuracy | 1 | 1 = high (£10 m) 0 = low (>10 m) 0 = default The PA flag should be determined in accordance with Table 50 |
| Longitude | 28 | Longitude in 1/10 000 min (±180°, East = positive (as per 2’s complement), West = negative (as per 2’s complement); 181 = (6791AC0h) = not available = default) |
| Latitude | 27 | Latitude in 1/10 000 min (±90°, North = positive (as per 2’s complement), South = negative (as per 2’s complement); 91 = (3412140h) = not available = default) |
| Type of electronic position fixing device | 4 | Use of differential corrections is defined by field position accuracy above: 0 = undefined (default) 1 = global positioning system (GPS) 2 = GNSS (GLONASS) 3 = combined GPS/GLONASS 4 = Loran-C 5 = Chayka 6 = integrated navigation system 7 = surveyed 8 = Galileo 9-14 = not used 15 = internal GNSS |
| Transmission control for long-range broadcast message | 1 | 0 = default – Class-A AIS station stops transmission of Message 27 within an AIS base station coverage area. 1 = Request Class-A station to transmit Message 27 within an AIS base station coverage area. Base station coverage area should be defined by Message 23; If Message 23 is not received, the AIS station which is allowed to transmit on CH75 and 76 (see 3.2, Annex 4) should ignore this bit and transmit Message 27. |
| Spare | 9 | Not used. Should be set to zero. Reserved for future use |
| RAIM-flag | 1 | RAIM (Receiver autonomous integrity monitoring) flag of electronic position fixing device; 0 = RAIM not in use = default; 1 = RAIM in use see Table 50 |
| Communication state | 19 | SOTDMA communication state as described in § 3.3.7.2.1, Annex 2 |
| Number of bits | 168 |