Technical Provisions for Mode S Services and Extended Squitter

Appendix A A-69
MB FIELD
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
1 STATUS
2 SIGN
3 MSB = 90 degrees
4
5
6 BEARING TO WAYPOINT
7
8 Range = [–180, +180] degrees
9
10
11
12 LSB = 360/2 048 degrees
13 STATUS
14 MSB = 204.8 minutes
15
16
17
18 TIME TO GO
19
20 Range = [0, 410] minutes
21
22
23
24
25 LSB = 0.1 minutes
26 STATUS
27 MSB = 3 276.8 NM
28
29
30
31
32
33 DISTANCE TO GO
34
35 Range = [0, 6 554] NM
36
37
38
39
40
41
42 LSB = 0.1 NM
43
44
45
46
47
48
49
50 RESERVED
51
52
53
54
55
56
Table A-2-67. BDS code 4,3 — Next waypoint details
PURPOSE: To provide ready access to details about the next waypoint on
an aircraft’s route, without the need to establish a data link dialogue with the
flight management system. This will assist with short and medium term
tactical control.
1) The bearing to waypoint is the bearing from the current aircraft heading
position to the waypoint position referenced to true north.
Note.— Two’s complement coding is used for all signed fields as
specified in §A.2.2.2.
Draft
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris