Marine traffic signal
Marine traffic signal
| Parameter | No of bits | Description |
| Message ID | 6 | Identifier for Message 8; always 8. |
| Repeat Indicator | 2 | Used by the repeater to indicate how many times a message has been repeated.
0 – 3 0 = default 3 = do not repeat anymore |
| Source ID | 30 | MMSI number of source station. |
| Spare | 2 | Not used. Set to zero. |
| IAI | 16 | DAC =001; FI = 19 |
| Message Linkage ID | 10 | A source specific running number, unique across all binary messages equipped with Message Linkage ID. Used to link additional information to the message by a Text Description message. The Message Linkage ID, source MMSI and message FI uniquely identifies the sent message.
1 – 1,023 0 = not available = default |
| Name of Signal
Station |
120 | Maximum 20 characters 6 bits ASCII, as defined in ITU-R M. 1371-3, Table 44
“@@@@@@@@@@@@@@@@@@@@” = not available = default |
| Position of Station,
Longitude |
25 | Longitude in 1/1,000 min, ±180 degrees as per 2’s complement (East = positive, West = negative).
181 = not available = default |
| Position of Station,
Latitude |
24 | Latitude in 1/1,000 min, ±90 degrees as per 2’s complement (North = positive, South = negative).
91 degrees = not available = default |
| Status of Signal | 2 | 0 = not available = default
1 = In regular service 2 = Irregular service 3 reserved for future use |
| Signal in Service | 5 | (see Table 8.2) |
| Time of next Signal Shift | Time of next Signal Shift in UTC | |
| UTC Hour | 5 | 0 – 23
24 = not available = default 25-31 not used |
| UTC Minute | 6 | 0 – 59
60 = not available = default 61-63 not used |
| Expected Next Signal | 5 | (see Table 8.2) |
| Spare | 102 | Not used. Set to zero. |
| Total | 360 | Occupies 2 slots |
Table 8.2
Signal in Service[1]
| Value | Description |
| 0 | Not available = default |
| 1 | IALA port traffic signal 1: Serious emergency – all vessels to stop or divert according to instructions. |
| 2 | IALA port traffic signal 2: Vessels shall not proceed. |
| 3 | IALA port traffic signal 3: Vessels may proceed. One way traffic. |
| 4 | IALA port traffic signal 4: Vessels may proceed. Two way traffic. |
| 5 | IALA port traffic signal 5: A vessel may proceed only when it has received specific orders to do so. |
| 6 | IALA port traffic signal 2a: Vessels shall not proceed, except that vessels which navigate outside the main channel need not comply with the main message. |
| 7 | IALA port traffic signal 5a: A vessel may proceed only when it has received specific orders to do so; except that vessels which navigate outside the main channel need not comply with the main message. |
| 8 | Japan Traffic Signal – I = “in-bound” only acceptable. |
| 9 | Japan Traffic Signal – O = “out-bound” only acceptable. |
| 10 | Japan Traffic Signal – F = both “in- and out-bound” acceptable. |
| 11 | Japan Traffic Signal – XI = Code will shift to “I” in due time. |
| 12 | Japan Traffic Signal – XO = Code will shift to “O” in due time. |
| 13 | Japan Traffic Signal – X = Vessels shall not proceed, except a vessel which receives the direction from the competent authority. |
| 14 – 31 | (reserved for future use) |