190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. F Page B-3
B.1.4 Aviation Output Sentence Type 2
The GTR/GNC Type 2 aviation output sentence has the following general format:
id - item designator (3 ASCII characters)
seq - sequence number (1 binary byte)
wpt - waypoint identifier (5 ASCII characters)
lat - waypoint latitude (3 binary bytes)
lon - waypoint longitude (4 binary bytes)
mvar - magnetic variation at waypoint (2 binary bytes)
CR - ASCII carriage return character (0D hex)
LF - ASCII line feed character (0A hex)
Each waypoint in the route being navigated by the interfacing equipment has a Type 2 sentence output by
the interfacing navigation equipment approximately once every second.
If no route is being navigated by the interfacing navigation equipment (i.e., the active route is empty), the
following Type 2 sentence is output approximately once every second:
id - item designator (3 ASCII characters; route sequence number is "01")
seq - sequence number (1 binary byte; last waypoint flag is set; route sequence number is 1)
CR - ASCII carriage return character (0D hex)
LF - ASCII line feed character (0A hex)
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