Trimble Outdoors 58052-00 Benutzerhandbuch

Copernicus GPS Receiver     2 2 3

NMEA 0183     C

The RMC message contains the time, date, position, course, and speed data provided 
by the GPS navigation receiver. A checksum is mandatory for this message and the 
transmission interval may not exceed 2 seconds. All data fields must be provided 
unless the data is temporarily unavailable. Null fields may be used when data is 
temporarily unavailable.

$GPRMC,hhmmss.ss,A,llll.lllll,a,yyyyy.yyyyy,a,

x.x,x.x,xxxxxx,x.x,a,i*hh<CR><LF>

The VTG message conveys the actual track made good (COG) and the speed relative 
to the ground (SOG).

$GPVTG,x.x,T,x.x,M,x.x,N,x.x,K,i*hh<CR><LF

>

Table C.9

RMC - Recommended Minimum Specific GPS / Transit Data Message 
Parameters

Field #

Description

1

UTC of Position Fix (when UTC offset has been decoded by the 
receiver).

2

Status: A = Valid, V = navigation receiver warning

3,4

Latitude, N (North) or S (South).

5,6

Longitude, E (East) or W (West).

7

Speed over the ground (SOG) in knots

8

Track made good in degrees true.

9

Date: dd/mm/yy

10,11

Magnetic variation in degrees, E = East / W= West

12

Position System Mode Indicator; A=Autonomous, 
D=Differential, E=Estimated (Dead Reckoning), M=Manual 
Input, S=Simulation Mode, N=Data Not Valid

hh

Checksum (Mandatory for RMC)

Table C.10

VTG - Track Made Good and Ground Speed Message Parameters

Field #

Description

1

Track made good in degrees true.

2

Track made good in degrees magnetic.

3,4

Speed over the ground (SOG) in knots.

5,6

Speed over the ground (SOG) in kilometer per hour.

7

Mode Indicator: A=Autonomous Mode, D=Differential Mode, 
E=Estimated (dead reckoning) Mode, M=Manual Input Mode, 
S=Simulated Mode, N-Data Not Valid

hh

Checksum