APPENDIX
AP-27
TTD - Tracked target data
$--TTD,hh,hh.x,s--s,a,x*hh<CR><LF>
| | | | |
| | | | +----- 5
| | | +------- 4
| | +------- 3
| +----- 2
+-----1
1. Total hex number of sentences need to transfer the messages
2. Hex sentence number, 1 to FF
3. Sequential message identifier, 0 to 9
4. Encapsulated tracked target data
5. Number of fill bits, 0 to 5
TTM - Tracked target message
$--TTM,x.x,x.x,x.x,a,x.x,x.x,a,x.x,x.x,a,c--c,a,a,hhmmss.ss,a*hh<CR><LF>
| | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | +----- 14
| | | | | | | | | | | | | | +------- 13
| | | | | | | | | | | | | +-------------- 12
| | | | | | | | | | | | +------------------- 11
| | | | | | | | | | | +--------------------- 10
| | | | | | | | | | +------------------------ 9
| | | | | | | | | +---------------------------- 8
| | | | | | | | +------------------------------- 7
| | | | | | | +----------------------------------- 6
| | | | | +--+-------------------------------------- 5
| | | | +--------------------------------------------- 4
| | +--+------------------------------------------------ 3
| +------------------------------------------------------- 2
+---------------------------------------------------------- 1
1. Target number, 00 to 99
2. Target distance from own ship
3. Bearing from own ship, degrees, true/relative (T/R)
4. Target speed
5. Target course, degrees true/relative (T/R)
6. Distance of closet point of approach
7. Time to CPA, min., "-"increasing
8. Speed/distance units, K/N/S
9. User data (e.g. target name)
10. Target status (see note)
11. Reference target = R, null otherwise
12. Time of data (UTC)
13. Type of acquisition A=automatic, M=manual, R=reported
14. Checksum
NOTE - Target status:
L = lost, tracked target has been lost
Q = query, target in the process of acquisition
T = tracking
