GLOBALSAT ET-314 GPS Engine Board - Manual (Page 12)

ET-314AC
High Performance GPS Engine Board
2010/4/1
- 12 -
SNR(C/No) 42 dBHz Range 0 to 99,null when not tracking
Checksum *71
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End of message termination
1. Depending on the number of satellites tracked, multiple messages of GSV data may be
required. In some software versions, the maximum number of satellites reported as visible is
limited to 12, even though more may be visible.
RMC - Recommended Minimum Specific GNSS Data
Note – Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA
message description
Table A-6 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598,,*10
Table A-6 RMC Data Format
Name Example
Units Description
Message ID $GPRMC RMC protocol header
UTC Time 161229.487 hhmmss.sss
Status 1 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
East/West Indicator 2 E E=east
Mode A A=Autonomous, D=DGPS, E=DR
N=Output Data Not Valid
Checksum *10
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1. A valid status is derived from all the parameters set in the software. This includes the
minimum number of satellites required, any DOP mask setting, presence of DGPS
corrections, etc. If the default or current software setting requires that a factor is met, then if
that factor is not met the solution will be marked as invalid.
2. SiRF Technology Inc. does not support magnetic declination. All “course over ground” data