GM-168 USER’S MANUAL
10
GGA –Global Positioning System Fix Data
Time, position and fix related data for a GPS receiver.
Format:$GPGGA,hhmmss.dd,xxmm.dddd,<N|S>,yyymm.dddd,<E|W>,v,ss,d.d,h.h,M,g.g,M,a.a,xxxx*hh<CR><LF>
Example: $GPGGA,134829.48,1126.6639,S,11133.3299,W,1,07,1.0,,,,,,*15
Parameter Description Example
hhmmss.dd UTC time, hh = hours, mm = minutes, ss = seconds,
dd = decimal part of seconds 13:48:29.48
xxmm.dddd Latitude, xx = degrees, mm = minutes,
dddd = decimal part of minutes 11 deg.
26.6639 min.
<N|S> Either character N or character S,
N = North, S = South South
yyymm.dddd Longitude, yyy = degrees, mm = minutes,
dddd = decimal part of minutes 111 deg.
33.3299 min.
<E| W> Either character E or character W,
E = East, W = West West
vFix valid indicator, 0=Fix not valid, 1=Fix valid Fix valid
ss Number of satellites used in position fix,
00-12. Fixed length 7 satellites
d.d HDOP –Horizontal Dilution Of Precision HDOP = 1.0
h.h Altitude (mean-sea-level, geoid)
MNULL (missing)
g.g NULL (missing)
MNULL (missing)
a.a NULL (missing)
xxxx NULL (missing)
hh Check sum 15
VTG –Course over Ground and Ground Speed
Course and speed
Format: $GPVTG,h.h,T,m.m,M,s.s,N,s.s,K,M*hh<CR><LF>
Example: $GPVTG,202.60,T,,,0.38,N,0.7,K,A*0D
Parameter Description Example
h.h Heading 202.60
TDegrees (heading units). Degree
m.m Magnetic heading. Currently NULL (missing).
MDegrees. Magnetic heading units.
Currently NULL (missing).
s.s Speed, knots. Speed = 0.38
NKnots (Speed unit) Knots
s.s Speed, km/h. Speed = 0.7
Kkm/h (Speed units). km/h
MMode indicator, A = autonomous, N = data not valid Autonomous
hh Check sum 0D
