Trimble Outdoors 5700/5800 User Manual
Page 174
A NMEA-0183 Output
1 62 5700/5800 GPS Receiver User Guide
5700/
5800 GPS Receiv
er Oper
ation
GSA
GNSS DOP and active satellites
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>
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.4
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
7
Checksum
Table A.3
GGA message fields (continued)
Field
Meaning