Garmin GNC 420AW Installation Manual - page 158
Page E-4
400W Series Installation Manual
Rev. G
190-00356-02
SHADIN “G” FORMAT
GA012
"GA" (ASCII characters); "012" represents indicated Air Speed (knots)
GB345
"GB" (ASCII characters); "345" represents true Air Speed (knots)
GC678
"GC" (ASCII characters); "678" represents Mach Speed (thousandths)
GD<+/->9012
"GD" (ASCII characters); sign; "9012" represents pressure altitude (tens of feet)
GE<+/->3456
"GE" (ASCII characters); sign; "3456" represents density altitude (tens of feet)
GF<+/->78
"GF" (ASCII characters); sign; "78" represents outside air temperature (Celsius)
GG<+/->90
"GG" (ASCII characters); sign; "90" represents true air temperature (Celsius)
GH123
"GH" (ASCII characters); "123" represents wind direction (degrees from north)
GI456
"GI" (ASCII characters); "456" represents wind speed (knots)
GJ<+/->78
"GJ" (ASCII characters); sign; "78" represents rate of turn (degrees per second)
GK<+/->901
"GK" (ASCII characters); sign; "901" represents vertical speed (tens of ft/minute)
GL234
"GL" (ASCII characters); "234" represents heading (degrees from north)
GM5678
†
"GM" (ASCII characters); "5678" represents fuel flow, right (Twin only) (tenths gallons/hour)
GN90123
†
"GN" (ASCII characters); "90123" represents fuel used, right (Twin only) (tenths gallons)
GO4567
"GO" (ASCII characters); "4567" represents fuel flow, left (or Single) (tenths gallons/hour)
GP89012
"GP" (ASCII characters); "89012" represents fuel used, left (or Single) (tenths gallons)
GQ001
"GQ" (ASCII characters); "001" represents error log/reason indicator (001 = temp. sensor error,
000 = no errors)
GR6789.0
†
"GR" (ASCII characters); "6789.0" represents fuel remaining (gallons)
Ga<+/->1234
"Ga" (ASCII characters); sign; "12.34" represents barometric corrected altitude (tens of feet)
Gb56.78
"Gb" (ASCII characters); "56.78" represents current barometric pressure setting (inches Hg)
G*901
"G*" (ASCII characters); "901" represents checksum
Where:
<+/-> sign indicator (0x2b["+"] or 0x2d["-"])
†
Not available from Airdata Computer
Note: Checksum is calculated by adding each byte in the message (including all characters from
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).