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when determining waypoint coordinate values.
2. The convention for coding is as follows:
Most significant bit is the sign bit:
0 = positive
1 = negative
The other bits represent the absolute value.
3. The convention for coding is as follows:
0 = no
1 = yes
The “Y coordinate follows” bit is set to ZERO (no) to indicate that the Y coordinate for the waypoint is zero. In this
case, the Y coordinate field is not used. The “Z coordinate follows” bit is set to ZERO (no) to indicate either that the
waypoint is two-dimensional or that it lies on a constant gradient between two waypoints for which the Z coordinate
is transmitted. In either of these two cases, the Z coordinate field is not used.
4. This field is coded as an unsigned value with an offset of –100 m. A value of zero in this field would therefore
represent a Z coordinate of –100 m.
5. Data fields which follow the next segment/field identifier are transmitted only for certain cases. The coding of the
next segment/field identifier and use of subsequent data fields are defined in Table A-17.
6. Waypoint index numbers are assigned by sequentially numbering all waypoints in the approach azimuth or back
azimuth database. If a waypoint at the primary runway threshold is coded using only a threshold crossing height, it is
omitted from the waypoint index sequence. The next waypoint index field always refers to an index number lower
than that of the current waypoint. The missed approach index field always refers to an index number higher than that
of the current waypoint.
Annex 10 — Aeronautical Communications Volume I
Table A-17. Next segment/field identifiers
(see 3.11.4.8.3.2)
Application Data field(s) to follow identifier
Next
waypoint
location
Next
waypoint
shared
(Note 1)
Linked to
missed
approach
Segment
type
Next
segment/
field
identifier
Approach
procedure
Missed approach
procedure
Departure
procedure
Straight 0
No
Curved 1
Next waypoint X coordinate
Straight 2
Any
Yes
No
Curved 3
1. Next waypoint index
2. Next procedure first waypoint X coordinate
No 4
1. Threshold waypoint height
2. Next procedure first waypoint
X coordinate
Next procedure first waypoint
X coordinate
Primary
runway
threshold
Yes
Straight
5
1. Threshold waypoint height
2. Missed approach index
3. Next procedure first waypoint
X coordinate
Not allowed
(see Note 3)
No
None
(see Note
2)
6
1. Virtual azimuth to waypoint
distance
2. Next procedure first waypoint
X coordinate
Next procedure first waypoint
X coordinate
None
No
Yes
Straight to
first flown
missed
approach
waypoint
7
1.Virtual azimuth to waypoint
distance
2. Missed approach index
3. Next procedure first waypoint
X coordinate
Not allowed
(see Note 3)
NOTES.—
1. A shared waypoint is a waypoint that is identified in the current procedure by waypoint index number only. The waypoint coordinates are explicitly
defined as part of another procedure.
2. Beyond this waypoint, guidance information is provided relative to the straight line extended from the current waypoint, tangent to the path entering
the waypoint. In the case of a missed approach procedure, this line intersects the last approach waypoint.
3. Next segment/field identifier values 5 and 7 are reserved for use in approach procedures only. Missed approach and departure procedures may share
approach waypoints which use these values, ignoring the data fields for threshold waypoint height, virtual azimuth to threshold distance and missed
approach index.
___________________
23/11/06 APP A-22
APPENDIX B. TECHNICAL SPECIFICATIONS FOR
THE GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS)
1. DEFINITIONS
GBAS/E. A ground-based augmentation system transmitting an elliptically-polarized VHF data broadcast.
GBAS/H. A ground-based augmentation system transmitting a horizontally-polarized VHF data broadcast.
Receiver. A subsystem that receives GNSS signals and includes one or more sensors.
Reserved (bits/words/fields). Bits/words/fields that are not allocated, but which are reserved for a particular GNSS
application.
Spare (bits/words/fields). Bits/words/fields that are not allocated or reserved, and which are available for future allocation.
Note.— All spare bits are set to zero.
2. GENERAL
Note.— The following technical specifications supplement the provisions of Chapter 3, 3.7.
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