Garmin GNC 255 Installation Manual - page 96
GTR 225/GNC 255 TSO Installation Manual
190-01182-02
Page B-16
Rev. B
B.2.4.2.7 Decoded OBS setting
This message outputs the current OBS setting, which may be read from the NAV’s internal resolver, the
last valid value received over serial, or from user input to the front panel.
Message format:
“V” ..........................Message class. This is a GNC NAV message.
“22”.........................Message identifier.
v ..............................Valid flag. “0” (zero) = OBS invalid/not present, “V” = OBS setting is valid.
ddd ..........................Three digit OBS setting, in degrees. Values are in the range of “000” to
“359”.
Example message:
$PGRMV22V170
A valid OBS setting of 170 degrees.
B.2.4.2.8 Radial From Active VOR
This message outputs the current bearing from the active VOR station.
Message format:
“V” ..........................Message class. This is a VHF NAV message.
“23”.........................Message identifier.
v ..............................Valid flag. “0” = bearing not valid, “V” = bearing is valid.
dddf .........................Bearing to a resolution of 1/10th of a degree. ddd = three digit bearing in
degrees, ranging from “000” to “359”. f = 1/10th of a degree.
Example message:
$PGRMV23V1654
A valid bearing of 165.4 degrees FROM the active VOR station.
B.2.4.2.9 Decoded Station Identifier
This message outputs the decoded station identifier received on the NAV voice channel. This message
will be output even if the station identifier has not been decoded yet. In this case, the message will be
flagged as invalid. Note that the validity of this message does not depend on the current NAV audio mode.
The decoding is done automatically regardless of this setting.
Message format:
“V” ..........................Message class. This is a GNC NAV message.
“25”.........................Message identifier.
v ..............................Valid flag. “0” = identifier is not valid, “V” = decoded station identifier is
valid.
iiiii...........................Decoded station identifier, five characters long. If the decoded identifier is
less than five characters in length, then the trailing characters will be filled in
with spaces. Identifiers are restricted to using ASCII character 0-9 and A-Z.