Command and Log Reference
41
ID
Field
Description
Symbol
Example
E = Estimated (dead reckoning) mode
M = Manual input mode
S = Simulator mode
N = Data not valid
14
*xx
Checksum
*hh
*72
15
[CR][LF]
Sentence terminator
[CR][LF]
6.1.12
GNRMC GNSS Recommended Information
This log contains time, date, position, heading and velocity data calculated by
receivers. RMC is the recommended minimum navigation data for receivers.
The GNRMC log outputs these messages without waiting for a valid almanac.
Instead, it uses a UTC time, calculating with default parameters. In this case, the UTC
time status 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 to calculate.
Then the UTC time status is set to VALID.
Recommend Input:
Output 1Hz GNRMC message from current serial port:
GNRMC 1
Output 1Hz GNRMC message from com2:
GNRMC COM2 1
LOG output
$GNRMC,094403.00,A,4004.73794422,N,11614.18999462,E,0.037,5.5,
260815,6.5,W,A*35
Table 6-13: GNRMC Message Description
ID
Field
Description
Symbol
Example
1
$GNRMC
Log header
$GNRMC
2
utc
UTC time of the current position
hhmmss.ss
144326.00
3
pos status
Position status:
A = Data valid, V = Positioning 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
Course Over Ground, degrees True
x.x
323.3
10
date
Date: dd/mm/yy
xxxxxx
210307
11
mag var
Magnetic variation, degrees
x.x
0.0
12
var dir
Direction of magnetic variation
a
E
