NMEA-0183 message: GSA

Related Topics

GPS DOP and active satellites

An example of the GSA message string is:

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

GSA message fields

Field Meaning
0 Message ID $GPGSA
1 Mode 1, M = manual, A = automatic
2 Mode 2, Fix type, 1 = not available, 2 = 2D, 3 = 3D
3 PRN number, 01 through 32 for GPS, 33 through 64 for SBAS, 64+ for GLONASS
4 PDOP: 0.5 through 99.9
5 HDOP: 0.5 through 99.9
6 VDOP: 0.5 through 99.9
7 The checksum data, always begins with *