Garmin GPS 400W Installation Manual page 158

SHADIN "G" FORMAT
<STX>
GA012<CR><LF>
GB345<CR><LF>
GC678<CR><LF>
GD<+/->9012<CR><LF>
GE<+/->3456<CR><LF>
GF<+/->78<CR><LF>
GG<+/->90<CR><LF>
GH123<CR><LF>
GI456<CR><LF>
GJ<+/->78<CR><LF>
GK<+/->901<CR><LF>
GL234<CR><LF>
GM5678<CR><LF>†
GN90123<CR><LF>†
GO4567<CR><LF>
GP89012<CR><LF>
GQ001<CR><LF>
GR6789.0<CR><LF>†
Ga<+/->1234<CR><LF>
Gb56.78<CR><LF>
G*901<CR><LF>
<ETX>
Where:
<STX> start-transmit character (0x02)
<CR> carriage-return character (0x0d)
<LF> line-feed character (0x0a)
<+/-> sign indicator (0x2b["+"] or 0x2d["-"])
<ETX> end-transmit character (0x03)
†
Not available from Airdata Computer
Note: Checksum is calculated by adding each byte in the message (including all characters from <STX>
up to and including the error log/reason indicator), such that carries are discarded to give a one byte
result. The ASCII-coded decimal representation of that byte is given, ranging from 0 (0x30, 0x30, 0x30)
to 255 (0x32, 0x35, 0x35).
Page E-4
Rev. G
"GA" (ASCII characters); "012" represents indicated Air Speed (knots)
"GB" (ASCII characters); "345" represents true Air Speed (knots)
"GC" (ASCII characters); "678" represents Mach Speed (thousandths)
"GD" (ASCII characters); sign; "9012" represents pressure altitude (tens of feet)
"GE" (ASCII characters); sign; "3456" represents density altitude (tens of feet)
"GF" (ASCII characters); sign; "78" represents outside air temperature (Celsius)
"GG" (ASCII characters); sign; "90" represents true air temperature (Celsius)
"GH" (ASCII characters); "123" represents wind direction (degrees from north)
"GI" (ASCII characters); "456" represents wind speed (knots)
"GJ" (ASCII characters); sign; "78" represents rate of turn (degrees per second)
"GK" (ASCII characters); sign; "901" represents vertical speed (tens of ft/minute)
"GL" (ASCII characters); "234" represents heading (degrees from north)
"GM" (ASCII characters); "5678" represents fuel flow, right (Twin only) (tenths gallons/hour)
"GN" (ASCII characters); "90123" represents fuel used, right (Twin only) (tenths gallons)
"GO" (ASCII characters); "4567" represents fuel flow, left (or Single) (tenths gallons/hour)
"GP" (ASCII characters); "89012" represents fuel used, left (or Single) (tenths gallons)
"GQ" (ASCII characters); "001" represents error log/reason indicator (001 = temp. sensor error,
000 = no errors)
"GR" (ASCII characters); "6789.0" represents fuel remaining (gallons)
"Ga" (ASCII characters); sign; "12.34" represents barometric corrected altitude (tens of feet)
"Gb" (ASCII characters); "56.78" represents current barometric pressure setting (inches Hg)
"G*" (ASCII characters); "901" represents checksum
400W Series Installation Manual
190-00356-02