Tidal window
| Parameter | No. of bits | Description |
|---|---|---|
| Message ID | 6 | Identifier for Message 6; always 6 |
| 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 |
| Sequence Number | 2 | 0-3. |
| Destination ID | 30 | MMSI number of destination station |
| Retransmit Flag | 1 | Retransmit Flag should be set upon retransmission: 0 = no retransmission = default; 1 = retransmitted. |
| Spare | 1 | Not used. Should be zero. |
| IAI | 16 | DAC = 001; FI = 14 |
| 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 |
| Position #1 Lat | 27 | 1/10 000 min (±90 degrees, North = positive, South = negative; 91 degrees = not available = default). |
| Position #1 Lon | 28 | 1/10 000 min (±180 degrees, East = positive, West = negative; 181 degrees = not available = default). |
| From UTC hour | 5 | 0-23; 24 = UTC hour not available = default; 25-31not used |
| From UTC minute | 6 | 0-59; 60 = UTC minute not available = default; 61-63 unused |
| To UTC hour | 5 | 0-23; 24 = UTC hour not available = default; 25-31not used |
| To UTC minute | 6 | 0-59; 60 = UTC minute not available = default; 61-63 unused |
| Current direction predicted #1 | 9 | Current direction in degrees. ( valid range 0-359, 360 = not available = default). |
| Current speed predicted #1 | 7 | Current speed in 0,1 knots. (valid range 0-126; 127 = not available = default). |
| Position #2 Lat | 27 | 1/10 000 min (±90 degrees, North = positive, South = negative; 91 degrees = not available = default). |
| Position #2 Lon | 28 | 1/10 000 min (±180 degrees, East = positive, West = negative; 181 degrees = not available = default). |
| From UTC hour | 5 | 0-23; 24 = UTC hour not available = default; 25-31not used |
| From UTC minute | 6 | 0-59; 60 = UTC minute not available = default; 61-63 unused |
| To UTC hour | 5 | 0-23; 24 = UTC hour not available = default; 25-31not used |
| To UTC minute | 6 | 0-59; 60 = UTC minute not available = default; 61-63 unused |
| Current direction predicted #2 | 9 | Current direction in degrees. ( valid range 0-359, 360 = not available = default). |
| Current speed predicted #2 | 7 | Current speed in 0,1 knots. (valid range 0-126; 127 = not available = default). |
| Position #3 Lat | 27 | 1/10 000 min (±90 degrees, North = positive, South = negative; 91 degrees = not available = default). |
| Position #3 Lon | 28 | 1/10 000 min (±180 degrees, East = positive, West = negative; 181 degrees = not available = default). |
| From UTC hour | 5 | 0-23; 24 = UTC hour not available = default; 25-31not used |
| From UTC minute | 6 | 0-59; 60 = UTC minute not available = default; 61-63 unused |
| To UTC hour | 5 | 0-23; 24 = UTC hour not available = default; 25-31not used |
| To UTC minute | 6 | 0-59; 60 = UTC minute not available = default; 61-63 unused |
| Current direction predicted #3 | 9 | Current direction in degrees. ( valid range 0-359, 360 = not available = default). |
| Current speed predicted #3 | 7 | Current speed in 0,1 knots. (valid range 0-126; 127 = not available = default). |
| Total number of bits | 376 | occupies 3 slots |