Trimble Outdoors r7 User Manual

A       NMEA-0183 Output

1 7 6      Trimble R7/R8 GPS Receiver User Guide

An example of the GSA message string is shown below. Table A.4 
describes the message fields.

$GPGSA,<1>,<2>,<3>,<3>,,,,,<3>,<3>,<3>,<4>,<5>,
<6>*<7><CR><LF> 

13

Age of differential GPS data record, Type 1 or Type 9. Null field 
when DGPS is not used.

14

Reference station ID, ranging from 0000 to 1023. A null field when 
any reference station ID is selected and no corrections are 
received.

1

Mode 1, M = manual, A = automatic

2

Mode 2, Fix type, 1 = not available, 2 = 2D, 3 = 3D

3

PRN number, 01 to 32, of satellite used in solution, up to 12 
transmitted

4

PDOP-Position dilution of precision, 0.5 to 99.9

5

HDOP-Horizontal dilution of precision, 0.5 to 99.9

6

VDOP-Vertical dilution of precision, 0.5 to 99.9

7

Checksum