NMEA-0183 message: GSA
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 * |