ET-312
The Specifications are subject to be changed without notice. Copyright
©
2007, GlobalSat Technology.
Page 12 of 21
Version 1.4
$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71
$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41
Table B-8 GSV Data Format
Name Example Description
Message ID
$GPGSV
GSV protocol header
Number of Messages
1
2
Range 1 to 3
Message Number
1
1
Range 1 to 3
Satellites in View
07
Satellite ID
07
Channel 1(Range 1 to 32)
Elevation 79
degrees
Channel 1(Maximum90)
Azimuth 048
degrees
Channel 1(True, Range 0 to 359)
SNR(C/No) 42
dBHz
Range 0 to 99,null when not tracking
…….
…….
Satellite ID
27
Channel 4 (Range 1 to 32)
Elevation 27
Degrees
Channel 4(Maximum90)
Azimuth 138
Degrees
Channel 4(True, Range 0 to 359)
SNR(C/No) 42
dBHz
Range 0 to 99,null when not tracking
Checksum *71
<CR><LF>
End
of
message termination
Depending on the number of satellites tracked multiple messages of GSV data may be required.
RMC-Recommended Minimum Specific GNSS Data
Table B-10 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598,,*10
Table B-10 RMC Data Format
Name Example Units
Description
Message ID
$GPRMC
RMC protocol header
UTC Time
161229.487
hhmmss.sss
Status
A
A=data valid or V=data not valid
Latitude
3723.2475
ddmm.mmmm
N/S Indicator
N
N=north or S=south
Longitude 12158.3416
dddmm.mmmm
E/W Indicator W E=east
or
W=west
Speed Over Ground
0.13
knots
Course Over Ground
309.62
degrees True
Date
120598
ddmmyy
Magnetic Variation
2
degrees
E=east or W=west
Checksum *10
<CR><LF>
End
of
message termination
SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS48 directions.
