GPRMC
GPS specific information
|
Platform: |
OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2 |
This log contains time, date, position, track made good and speed data provided by the GPS navigation receiver. RMC and RMB are the recommended minimum navigation data to be provided by a GNSS receiver.
A comparison of the position precision between this log and other selected NMEA logs can be seen in Table: Position Precision of NMEA Logs.
The GPRMC log outputs these messages without waiting for a valid almanac. Instead, it uses a UTC time, calculated with default parameters. In this case, the UTC time status (see the TIME log) is set to WARNING since it may not be one hundred percent accurate. When a valid almanac is available, the receiver uses the real parameters. Then the UTC time status is set to VALID.
If the NMEATALKER command is set to AUTO, the talker (the first 2 characters after the $ sign in the log header) is set to GP (GPS satellites only), GL (GLONASS satellites only), GA (Galileo satellites only), GQ (for QZSS satellites only), GB/BD (for BeiDou satellites only) or GN (satellites from multiple systems).
The position for the GPRMC log is reported in the user selected datum. See the DATUM command for more details.
Message ID: 225
Log Type: Synch
Recommended Input:
log gprmc ontime 1
Example 1 (GPS):
$GPRMC,203522.00,A,5109.0262308,N,11401.8407342,W,0.004,133.4,130522,0.0,E,D*2B
Example 2 (Multi-constellation):
$GNRMC,204520.00,A,5109.0262239,N,11401.8407338,W,0.004,102.3,130522,0.0,E,D*3B
See the Note in the GPGGA log that applies to all NMEA logs.
|
Field |
Structure |
Description |
Symbol |
Example |
|
1 |
$GPRMC |
Log header |
|
$GPRMC |
|
2 |
utc |
UTC of position |
hhmmss.ss |
144326.00 |
|
3 |
pos status |
Position status (A = data valid, V = data invalid) |
A |
A |
|
4 |
lat |
Latitude (DDmm.mm) |
llll.ll |
5107.0017737 |
|
5 |
lat dir |
Latitude direction: (N = North, S = South) |
a |
N |
|
6 |
lon |
Longitude (DDDmm.mm) |
yyyyy.yy |
11402.3291611 |
|
7 |
lon dir |
Longitude direction: (E = East, W = West) |
a |
W |
|
8 |
speed Kn |
Speed over ground, knots |
x.x |
0.080 |
|
9 |
track true |
Track made good, degrees True |
x.x |
323.3 |
|
10 |
date |
Date: dd/mm/yy |
xxxxxx |
210307 |
|
11 |
mag var |
Magnetic variation, degrees Note that this field is the actual magnetic variation and will always be positive. The direction of the magnetic variation is always positive. |
x.x |
0.0 |
|
12 |
var dir |
Magnetic variation direction E/W Easterly variation (E) subtracts from True course. |
a |
E |
|
13 |
mode ind |
Positioning system mode indicator, see Table: NMEA Positioning System Mode Indicator |
a |
A |
|
14 |
*xx |
Check sum |
*hh |
*20 |
|
15 |
[CR][LF] |
Sentence terminator |
|
[CR][LF] |
|
Mode |
Indicator |
|
A |
Autonomous |
|
D |
Differential |
|
E |
Estimated (dead reckoning) mode |
|
M |
Manual input |
|
N |
Data not valid |