User's Manual

VT-M2M-TC VM
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a=NorS
yyyyy.yy=Longitudeofposition
a=EorW
x=GPSQualityindicator(0=nofix,1=GPSfix,2=Dif.GPSfix)
xx=numberofsatellitesinuse
x.x=horizontaldilutionofprecision
x.x=Antennaaltitudeabovemean‐sea‐level
M=units
ofantennaaltitude,meters
x.x=Geoidalseparation
M=unitsofgeoidalseparation,meters
x.x=AgeofDifferentialGPSdata(seconds)
xxxx=DifferentialreferencestationID
4.2.2GPGSA
GPSDOPandactivesatellites
ex1:$GPGSA,A,3,,,,,,16,18,,22,24,,,3.6,2.1,2.2*3C
ex2:$GPGSA,A,3,19,28,14,18,27,22,31,39,,,,,1.7,1.0,1.3*35
ex3:$GPGSA,<1>,<2>,<3>,<4>,,,,,<11>,<12>,<13>,<14>,<15>,<16>,<17>*<18>
1=Mode:
M=Manual,forcedtooperatein2Dor3D
A=Automatic,3D/2D
2=Mode:
1=Fixnotavailable
2=2D
3=3D
3‐14=IDsofSVsusedinpositionfix(nullforunusedfields)

15=PDOP
16=HDOP
17=VDOP
18 =cheaksum
4.2.3GPGSV
GPSSatellitesinview
ex:$GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74
$GPGSV,3,2,11,14,25,170,00,16,57,208,39,18,67,296,40,19,40,246,00*74
$GPGSV,3,3,11,22,42,067,42,24,14,311,43,27,05,244,00,,,,*4D
$GPGSV,1,1,13,02,02,213,,03,‐3,000,,11,00,121,,14,13,172,05*67

1=Totalnumberofmessagesofthistypeinthiscycle