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$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 2-7 GSV Data Format
Name Example Units Description
Message ID $GPGSV GSV protocol header
Number of Messages 2 Range 1 to 3
Message Number 1 Range 1 to 3
Satellites in View 07
Satellite ID 07 Channel 1 (Range 1 to 32)
Elevation 79 degrees Channel 1 (Maximum 90)
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 (Maximum 90)
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
NOTE: Items <4>,<5>,<6> and <7> repeat for each satellite in view to a maximum of four (4) satellites per sentence.
Additional satellites in view information must be sent in subsequent sentences. These fields will be null if unused.
2.2.1.4 Recommended Minimum Specific GNSS Data (RMC)
Table 2-8 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598, ,*10
Table 2-8 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 Variation1 degrees E=east or W=west
Checksum *10
<CR> <LF> End of message termination
1.SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are geodetic
WGS84 directions.
2.2.2 RTCM Received Data
The default communication parameters for DGPS Input are 9600 baud, 8 data bits, stop bit, and no parity. Position
accuracy of less than 5 meters can be achieved with the GR-271 by using Differential GPS (DGPS) real-time pseudo-range
correction data in RTCM SC-104 format, with message types 1,2, or 9. As using DGPS receiver with different
10


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