Trimble Outdoors SK8 - Manual (Page 186)

E-6 Lassen-SK8 Embedded GPS Module
NMEA 0183
E.4.5 RMC - Recommended Minimum Specific GPS/Transit Data
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.
RMC,hhmmss.s,A,llll.lll,a,yyyyy.yyy,a,x.x,x.x,xxxxxx,x.
x,a*hh
E.4.6 VTG - Track Made Good and Ground Speed
The VTG message conveys the actual track made good (COG) and the speed relative to
the ground (SOG).
VTG,x.x,T,x.x,M,x.x,N,x.x,K
Table E-7. RMC - Recommended Minimum Specific GPS / Transit Data
Message Parameters
Field # Description
1 UTC of Position Fix.
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 Checksum (Mandatory for RMC)
Table E-8. 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.