Trimble Outdoors AcutimeTM2000 Synchronization Kit manual GSA GPS DOP and Active Satellites

C NMEA 0183

C.4.3 GSA – GPS DOP and Active Satellites

The GSA messages indicates the GPS receiver's operating mode and lists the satellites used for navigation and the DOP values of the position solution.

$GP GSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx, xx,xx,x.x,x.x,x.x*hh<CR><LF>

Table C-5	GSA – GPS DOP and Active Satellites
	Message Parameters
Field #	Description
1	Mode: M = Manual, A = Automatic. In manual mode, the
	receiver is forced to operate in either 2D or 3D mode. In
	automatic mode, the receiver is allowed to switch
	between 2D and 3D modes subject to the PDOP and
	satellite masks.
2	Current Mode: 1 = fix not available, 2 = 2D, 3 = 3D
3 to 14	PRN numbers of the satellites used in the position
	solution. When less than 12 satellites are used, the
	unused fields are null
15	Position dilution of precision (PDOP)
16	Horizontal dilution of precision (HDOP)
17	Vertical dilution of precision (VDOP)
hh	Checksum

Acutime 2000 Synchronization Kit User Guide C-7