Trimble R6/R7 GPS and Trimble R8 GNSS Receivers User Guide 129
NMEA-0183 Output A
Trimble R6 and R7 GPS/R8 GNSS Receiver Operation
GSA GNSS DOP and active satellites
An example of the GSA message string is shown below. Table A.3 describes the
message fields.
$GPGSA,<1>,<2>,<3>,<3>,,,,,<3>,<3>,<3>,<4>,<5>,
<6>*<7><CR><LF>
5 Direction of longitude:
E: East
W: West
6 GPS Quality indicator:
0: Fix not valid
1: GPS fix
2: Differential GPS fix
4: Real Time Kinematic, fixed integers
5: Real Time Kinematic, float integers
7 Number of SVs in use, range from 00 to 12
8 HDOP
9 Orthometric height (MSL reference)
10
M: unit of measure for height is meters
11 Geoid separation
12
M: geoid separation is measured in meters
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.
Table A.3 GSA message fields
Field Meaning
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
7Checksum
Table A.2 GGA message fields (continued)
Field Meaning
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