190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page C-6
C.6 GPS Data Message Formats
The GPS category contains two message formats. The GPS Position, Velocity, and Time (PVT) message
format and the GPS Data message format are transmitted approximately once per second. Table C-4 and
Table C-5
explain the message formats.
Table C-4 GPS PVT Message Format
Field Name Offset Width Units Notes Min Max
Escape character 0 1 '@'
UTC year 1 2 years last two digits of UTC year 00 99
UTC month 3 2 months 01 12
UTC day 5 2 days 01 31
UTC hour 7 2 hours 0 23
UTC minute 9 2 minutes 0 59
UTC second 11 2 seconds 0 59
Latitude hemisphere 13 1 'N' for north or 'S' for south
Latitude degrees 14 2 degrees 0 90
Latitude minutes 16 5
0.001
minutes
minutes x 1000 0 59999
Longitude hemisphere 21 1
Longitude degrees 22 3 degrees 'E' for east or 'W' for west 0 180
Longitude minutes 25 5
0.001
minutes
minutes x 1000 0 59999
Position status 30 1
'g' = 2D GPS position
'G' = 3D GPS position
'd' = 2D differential GPS
position
'D' = 3D differential GPS
position
'S' = simulated position
'_' = invalid position
Horizontal position error 31 3 meters 000 999
Altitude 34 6 meters height above or below MSL -99999 +99999
East/west velocity
direction
40 1 'E' for east or 'W' for west
East/west velocity
magnitude
41 4
0.1
meters/sec
0000 9999
North/south velocity
direction
45 1 'N' for north or 'S' for south
North/south velocity
magnitude
46 4
0.1
meters/sec
0000 9999
Vertical velocity
direction
50 1 'U' for up or 'D' for down
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