User's Manual

A NMEA-0183 Output
166 Trimble R7/R8 GPS Receiver User Guide
TrimbleR7/R8 GPS Receiver Operation
• A number of fields, depending on the message type, separated by
commas
• An asterisk
• A checksum value
Below is an example of a simple message with a message ID ($GPGGA),
followed by 13 fields and a checksum value:
$GPGGA,172814.0,3723.46587704,N,12202.26957864,W,2,6,1.2,18.
893,M,-25.669,M,2.0,0031*4F
A2.1 Message values
The following values can be found in NMEA messages that the receiver
generates.
Latitude and Longitude
Latitude is represented as ddmm.mmmm and longitude is represented
as dddmm.mmmm, where:
• dd or ddd is degrees
• mm.mmmm is minutes and decimal fractions of minutes
Direction
Direction (north, south, east, or west) is represented by a single
character: N, S, E, or W.
Time
Time values are presented in Universal Time Coordinated (UTC) and
are represented as hhmmss.cc, where:
• hh is hours, from 00 to 23
• mm is minutes
• ss is seconds
• cc is hundredths of seconds