Appendix-22
3：Magnitude of cross-track error
4：Direction to steer, L/R
5：Units, nautical miles
6：Mode indicator (see Notes 1 and 2)
NOTE 1 Positioning system mode indicator:
A = Autonomous mode;
D = Differential mode;
S = Simulator mode;
N = Data not valid.
NOTE 2 The positioning system mode indicator field supplements the positioning system status fields (fields 1 and
2); the status fields should be set to V = invalid for all values of indicator mode except for A = Autonomous and D =
Differential. The positioning system mode indicator and status fields should not be null fields.
・ZTG – UTC and time to destination waypoint
$--ZTG, hhmmss.ss, hhmmss.ss, c--c*hh<CR><LF>
1 2 3
1：UTC of observation
2：Time-to-go, hh = 00 to 99
3：Destination waypoint ID
・AAM – Waypoint arrival alarm
$--AAM, A, A,x.x, N, c--c*hh<CR><LF>
1：Status: A = arrival circle entered; V = not entered
2：Status: A = perpendicular passed at waypoint; V = not passed
3：Arrival circle radius
4：Units of radius, nautical miles
5：Waypoint ID
・RTE – Routes
$--RTE, x.x, x.x, a, c--c, c--c,...... c--c*hh<CR><LF>
1
2 3 4 5 6 7 8
1：Total number of sentences being transmitted (see Note 2)
2：Sentence number (see Note 2)
3：Message mode: c = complete route, all waypoints
w = working route, first listed waypoint is "FROM",
second is "TO" and remaining are rest of route
4：Route identifier
5：Waypoint identifier
6：Additional waypoint identifiers (see Note 1)
7：Additional waypoint identifiers (see Note 1)
8：Waypoint "n" identifier (see Note 1)
NOTE 1 A variable number of waypoint identifiers, up to "n", may be included within the limits of allowed sentence
length. As there is no specified number of waypoints, null fields are not required for waypoint identifier fields.
NOTE 2 A single route may require the transmission of multiple sentences, all containing identical field formats
when sending a complex message. The first field specifies the number of sentences, minimum value = 1. The
second field identifies the order of this sentence (sentence number), minimum value = 1. For efficiency, it is
permitted that null fields be used in the additional sentences when the data is unchanged from the first sentence.
(Note that this practice can lead to the incorrect assembly of sentences if there is a high risk of loss of sentence.)
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