2012/7/30
- 14 -
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 B-9 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598,,,A*10
Table B-9 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
R= Coarse Position
3
S=Simulator
Checksum
*10
<CR><LF>
End of message termination
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
are geodetic WGS84 directions relative to true North.
3. Position was calculated based on one or more of the SVs having their states derived from
almanac parameters, as opposed to ephemerides.
