Advice of waypoints (AWP) and/or route plan of VTS
Introduction/Additional information:
This IFM should be used by a VTS to advise its waypoints and/or its route plan. If the VTS uses this IFM 18 within an addressed binary message, then the waypoints and/or the route plan will be available to the addressed recipient, one ship, only. If the VTS uses this IFM 18 within a broadcast binary message, then the information will be available to all other ships in the VTSs vicinity.
When transmitting, the VTS should include up to 12 advised waypoints and/or a route specified by a textual description, if available. If waypoints are transmitted, then a recommended turning radius may be transmitted for each waypoint.
Registrant:
ITU-R.M.1371-1
DAC:
1
FI:
18
State:
deprecated
Number of slots (max):
5
Permitted as from:
01/01/1998
Not to be used after:
01/01/1998
Details:
| Number of bits | Description | ||
|---|---|---|---|
| AWP | 4 | Number of advised waypoints (1-12); 0 = no waypoint = default; 12-15 = not used | |
| WP i.Lon | 28 | Longitude of advised waypoint i in 1/10 000 min (±180°, East = positive, West = negative). Field required if and as often as 1 ≤ i ≤ AWP, i = 1, 2, 3, …, 12; field not required if AWP = 0 | |
| WP i.Lat | 27 | Latitude of advised waypoint i in 1/10 000 min (±90°, North = positive, South = negative). Field required if and as often as 1 ≤ i ≤ AWP, i = 1, 2, 3, …, 12; field not required if AWP = 0 | |
| Advised turning radius i | 12 | Advised turning radius at advised waypoint i in metres; 0 = not available = default; 1-4 095 m. Field required if and as often as 1 ≤ i ≤ AWP, i = 1, 2, 3, …, 12; field not required if AWP = 0 | |
| Advised route specified by textual description | 120 | Description of the advised route in textual form, e.g. —west channel“; maximum 20 characters using 6-bit ASCII; @@@@@@@@@@@@@@@@@@@@ = not available (field must not be omitted) | |
| Spare | AWP | Bits | Spare. Not used. Should be set to zero |
| 0, 8 | 4 | ||
| 1, 9 | 1 | ||
| 2, 10 | 6 | ||
| 3, 11 | 3 | ||
| 4, 12 | 0 | ||
| 5 | 5 | ||
| 6 | 2 | ||
| 7 | 7 | ||
| Number of bits | 128-928 | The number of bits of the IFM 17 may be calculated as follows: 124 + (AWP × 67) + spare | |
| Number of next waypoints transmitted | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| Number of slots used for this message | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 |