Tactical voyageplan broadcast, extended
Transmitter
Vessels only.
Transmission prerequisites
The message is only transmitted if vessel is conned along an active voyageplan.
Transmission triggering events
The following events must trigger a transmission of this message:
- Periodically. [Using AIS: To use periodic transmission intervals as defined for dynamic information in Table 1 of [AISSPEC5] (§4.2.1)]
- On voyage plan activation.
- On voyage plan change (change to waypoints or change of ETA to any waypoint of more than 10 minutes).
- On voyage plan deactivation/cancellation
- On change of active waypoint.
- As reply to message "tactical voyageplan inquiry".
Retransmission
Retransmission is not applicable.
Message format Waypoints are denoted WP0, WP1 , WPi ,…, WPn and are navigated in sequence. WP0 is the active waypoint currently steered towards. WPi , where i ≥ 1, is called following waypoints.
|
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 = 219; FI = 4 |
|
Parameter |
No. of bits |
Description |
|
Message may end here to indicate cancellation of previously announced tactical voyageplan. |
||
|
WP0, position |
28 |
Longitude in 1/10,000 min, ±180 degrees as per 2’s complement (East = positive, West = negative). |
|
27 |
Latitude in 1/10,000 min, ±90 degrees as per 2’s complement (North = positive, South = negative). |
|
|
WP0, ETA |
5 |
UTC hour |
|
|
|
Integer value |
|
|
|
Values outside the range 0-23 are illegal and must not be used. |
|
|
|
Values are current or future. |
|
|
6 |
UTC minute |
|
|
|
Integer value |
|
|
|
Values outside the range 0-59 are illegal and must not be used. |
|
WP0, TCR |
8 |
Turn circle radius at the active waypoint. Type: Integer. Unit: 1/100 of a nautical mile. 0 = no value 1 - 255 = turn circle radius of 0.01 nm - 2.55 nm |
|
Following waypoints with ETA and TCR |
n × 63 |
Variable no. of planned waypoints and ETA’s. n {0..12} See table 2 |
|
Total |
56 |
56 bits for cancellation. |
|
|
130 |
130 bits for WP0, no following WP’s. |
|
|
201 |
201 bits for WP0, 1 following WP. |
|
|
… |
… |
|
|
982 |
982 bits for WP0, 12 following WP. |
|
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 = 219; FI = 4 |
|
Parameter |
No. of bits |
Description |
|
Message may end here to indicate cancellation of previously announced tactical voyageplan. |
||
|
WP0, position |
28 |
Longitude in 1/10,000 min, ±180 degrees as per 2’s complement (East = positive, West = negative). |
|
27 |
Latitude in 1/10,000 min, ±90 degrees as per 2’s complement (North = positive, South = negative). |
|
|
WP0, ETA |
5 |
UTC hour |
|
|
|
Integer value |
|
|
|
Values outside the range 0-23 are illegal and must not be used. |
|
|
|
Values are current or future. |
|
|
6 |
UTC minute |
|
|
|
Integer value |
|
|
|
Values outside the range 0-59 are illegal and must not be used. |
|
WP0, TCR |
8 |
Turn circle radius at the active waypoint. Type: Integer. Unit: 1/100 of a nautical mile. 0 = no value 1 - 255 = turn circle radius of 0.01 nm - 2.55 nm |
|
Following waypoints with ETA and TCR |
n × 63 |
Variable no. of planned waypoints and ETA’s. n {0..12} See table 2 |
|
Total |
56 |
56 bits for cancellation. |
|
|
130 |
130 bits for WP0, no following WP’s. |
|
|
201 |
201 bits for WP0, 1 following WP. |
|
|
… |
… |
|
|
982 |
982 bits for WP0, 12 following WP. |
Table 10. Following waypoints.
|
Parameter |
No. of bits |
Description |
|
WPi, longitude |
28 |
Longitude in 1/10,000 min, ±180 degrees as per 2’s complement (East = positive, West = negative). |
|
WPi, latitude |
27 |
Latitude in 1/10,000 min, ±90 degrees as per 2’s complement (North = positive, South = negative). |
|
WPi, relative ETA |
8 |
Relative ETA from previous waypoint; measured in minutes. Integer value; [0-255]. 0 = Not used. Illegal value.
1 - 255 = Relative ETA measured in number of minutes from previous waypoint. |
|
WPi, TCR |
8 |
Turn circle radius at WPi.
Type: Integer. Unit: 1/100 of a nautical mile. 0 = no value 1 - 255 = turn circle radius of 0.01 nm - 2.55nm |
|
Total |
71 |
|
Table 11. No. of transmission slots.
|
Payload |
Bits |
Slots |
|
Cancellation |
55 |
1 |
|
Active waypoint, no following waypoints |
130 |
1 |
|
Active waypoint, 1 following waypoint |
201 |
2 |
|
Active waypoint, 2 following waypoints |
272 |
2 |
|
Active waypoint, 3 following waypoints |
343 |
2 |
|
Active waypoint, 4 following waypoints |
414 |
3 |
|
Active waypoint, 5 following waypoints |
485 |
3 |
|
Active waypoint, 6 following waypoints |
556 |
3 |
|
Transmitting more than 3 slots is not recommended |
||
|
Active waypoint, 7 following waypoints |
627 |
4 |
|
Active waypoint, 8 following waypoints |
698 |
4 |
|
Active waypoint, 9 following waypoints |
769 |
4 |
|
Payload |
Bits |
Slots |
|
Active waypoint, 10 following waypoints |
840 |
5 |
|
Active waypoint, 11 following waypoints |
911 |
5 |
|
Active waypoint, 12 following waypoints |
982 |
5 |
