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ET-314AC
High Performance GPS Engine Board
SNR(C/No)
Checksum
<CR><LF>
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
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
Message ID
UTC Time
1
Status
Latitude
N/S Indicator
Longitude
E/W Indicator
Speed Over Ground
Course Over Ground 309.62
Date
2
Magnetic Variation
East/West Indicator
Mode
Checksum
<CR><LF>
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
2010/4/1
42
dBHz
*71
apply only to NMEA version 2.3 (and later) in this NMEA
red
Example
Units
$GPRMC
161229.487
A
3723.2475
N
12158.3416
W
0.13
knots
degrees True
120598
degrees E=east or W=west
2
E
A
*10
Range 0 to 99,null when not tracking
End of message termination
Description
RMC protocol header
hhmmss.sss
A=data valid or V=data not valid
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
ddmmyy
E=east
A=Autonomous, D=DGPS, E=DR
N=Output Data Not Valid
End of message termination
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