Appendix 05 - 3
RS-232C AR-NAV Data Format
9600 baud 8 data bits, 1 stop bit, no parity. Type 1 sentence only sent every two seconds. Each line of
data is followed by a carriage return (CR) and a line feed (LF) character except the STX and ETX lines.
Header Data Description.
STX Hex 02.
z aaaaaCRLF GPS altitude in feet.
A s dd mmhhCRLF Latitude where s = N or S, dd = degrees
mm = minutes, hh = hundredths of minutes.
B s ddd mmhhCRLF Longitude designated as above.
C dddCRLF Magnetic track in whole degrees.
D sssCRLF Groundspeed in knots.
E dddddCRLF Distance to waypoint in 1/10ths of nm.
G snnnnCRLF Cross track error where s = L or R (of track)
and nnnn = error in 100ths of an nm.
I ddddCRLF Desired magnetic track in 10ths of a degree.
i.e. BRG to waypoint if you were on track.
K cccccCRLF Destination waypoint name. Dashes sent after
name if shorter than 5 characters.
L ddddCRLF Actual magnetic bearing to WPT (in 1/10ths
of a degree).
Q sdddCRLF Variation. s= E or W. ddd = 1/10ths degrees.
S ----eCRLF e = NAV flag. - = NAV valid, N = NAV not valid.
T ---------CRLF Indicates end of sentence type 1.
ETX Hex 03.
Notes on the AR-NAV sentence.
If the unit is not in NAV mode or does not have a fix, dashes (---) will be sent in fields E, G, I, K, L. Part e
of field S will be set to N.
If the unit does not have a fix, dashes will be sent in the latitude, longitude, track and ground speed fields.
If the variation value is greater than 99.9°, a fourth character will be sent in the Q field (i.e. sddddCRLF).
To Next Page
Loading...