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NMEA Manual based on MediaTek chipset - Manual
FTX-HW-13002-A
Preliminary
Page 5 of 39
1
NMEA default output messages
IT500 series receivers support standard NMEA0183 messages.
In the default configuration, output messages are GGA, RMC, GSV and GSA messages. The receiver can be
configured to have a user defined set of output messages, by command PMTK314 as described in chapter 2.12.
Output messages are utilized in Fastrax Workbench 5 to visualize the GPS/GNSS data. Default output messages
cover most of the applications.
1.1
GGA - Global Positioning System Fix Data
Time, position and fix related data for a GPS receiver.
Example:
$GPGGA,114353.000,6016.3245,N,02458.3270,E,1,10,0.81,35.2,M,19.5,M,,*50
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>
Type
Description
hhmmss.dd
UTC time of the fix.
hh=hours; mm=minutes; ss=seconds; dd=decimal part of seconds
xxmm.dddd
Latitude coordinate.
xx=degrees; mm=minutes; dddd=decimal part of minutes
<N/S>
Character denoting either N=North or S=South.
yyymm.dddd
Longitude coordinate.
yyy=degrees; mm=minutes; dddd=decimal part of minutes
<E/W>
Character denoting either E=East or W=West.
v
Fix valid indicator
1 = GPS fix (SPS)
2 = DGPS fix
3 = PPS fix
4 = Real Time Kinematic
5 = Float RTK
6 = estimated (dead reckoning) (2.3 feature)
7 = Manual input mode
8 = Simulation mode
ss
Number of satellites used in position fix, 00-12. Notice: Fixed length field of two letters.
d.d
HDOP - Horizontal Dilution Of Precision.
h.h
Altitude (mean-sea-level, geoid)
M
Letter M.
g.g
Difference between the WGS-84 reference ellipsoid surface and the mean-sea-level altitude.
M
Letter M.
a.a
-
xxxx
-
1.2
GLL – Geographic Position – Latitude/Longitude
Latitude and Longitude, UTC time of fix and status.
Example:
$GPGLL,6012.5674,N,02449.6545,E,072022.000,A,A*50
Format:
$GPGLL,xxmm.dddd,<N|S>,yyymm.dddd,<E|W>,hhmmss.ddd,S,M*hh<CR><LF>