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Examples
A.7
Syntax
Description of fields
NMEA Message Formats
The Mode indicator field supplements the Status field. The Status field is set to
A for the Mode indicators A and D. The Status field is set to V for the Mode
indicator N.
For NMEA v4.0 and v4.1:
Standard Talker ID = GPS only
$GPGLL,4724.5289712,N,00937.0834834,E,144659.00,A,A*68
Standard Talker ID = GNSS
$GNGLL,4724.5294325,N,00937.0836915,E,144839.00,A,A*72
GNS - GNSS Fix Data
$--GNS,hhmmss.ss,llll.ll,a,yyyyy.yy,a,c--c,xx,x.x,x.x,x.x,x.x,xxxx,h*hh<CR><LF>
Field
Description
$--GNS
Header including talker ID
hhmmss.ss
UTC time of position
llll.ll
Latitude (WGS 1984)
a
Hemisphere, North or South
yyyyy.yy
Longitude (WGS 1984)
a
East or West
c--c
Four character mode indicator for each GNSS constellation
used in the position where the
First character is for GPS
•
Second character is for GLONASS
•
Third character is for Galileo
•
Fourth character is for BeiDou
•
N = Satellite system not used in position fix or fix not valid
P = Precise, for example no deliberate degradation such as
SA
A = Autonomous; navigation fix, no real-time fix
D = Differential; real-time position, ambiguities not fixed
R = Real-time kinematic; ambiguities fixed
F = Float real-time kinematic
xx
Number of satellites in use. For $GNGGA messages: The
combined GPS, GLONASS, Galileo and BeiDou satellites used
in the position.
x.x
HDOP
x.x
Altitude of position marker above/below mean sea level in
metres. If no orthometric height is available the local ellips-
oidal height is exported. If the local ellipsoidal height is not
available either, the WGS 1984 ellipsoidal height is exported.
x.x
Geoidal separation in metres
x.x
Age of differential data
65
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