NMEA-0183 message: GSA

GPS DOP and active satellites

An example of the GSA message string is:

$GNGSA,A,3,21,5,29,25,12,10,26,2,,,,,1.2,0.7,1.0*27

$GNGSA,A,3,65,67,80,81,82,88,66,,,,,,1.2,0.7,1.0*20

GSA message fields

Field	Meaning
0	Message ID $GNGSA
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 for GPS 33 to 64 for SBAS 64+ for GLONASS
4	PDOP: 0.5 to 99.9
5	HDOP: 0.5 to 99.9
6	VDOP: 0.5 to 99.9
7	The checksum data, always begins with *

If NMEA-0183 version 4.10 is selected, the 7th and 8th fields become:

Field	Meaning
6	System ID based on: BeiDou 4
7	The checksum data, always begins with *