21
mm = minutes
ss = seconds
dd = decimal parts of seconds
Status Indicator
A
A = valid
V = invalid
Mode Indicator
A
A=autonomous
N=data not valid
Checksum *26
*hh
＜
CR
＞＜
LF
＞
End of message termination
GSA
－
GNSS DOP and Active Satellites
GPS receiver operating mode, satellites used in the navigation solution
reported by the GGA sentence, and DOP values.
$GPGSA,a,b,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,p.p,h.h,v.v*hh<CR><LF>
Example:
$GPGSA,A,3,03,15,17,18,22, 23,,,,,,,4.7,3.7,2.9*37
Name Example
Units Description
Message ID
$GPGSA
GSA protocol header
Mode 1
A
a
Mode: M = Manual, forced to operate in 2D
or 3D mode. A = Automatic, allowed to
automatically switch 2D/3D.
Mode 2
3
b
Mode: 1 = Fix not available, 2 = 2D, 3 = 3D
Satellite Used
03
xx
ID (PRN) numbers of GPS satellites used in
solution
PDOP 4.7
p.p
Position Dilution of Precision
HDOP 3.7
h.h
Horizontal Dilution of Precision
VDOP 2.9
v.v
Vertical Dilution of Precision
Checksum *37
*hh
＜
CR
＞＜
LF
＞
End of message termination
GSV
－
GNSS Satellites in View
Number of satellites in view, satellite ID (PRN) numbers, elevation, azimuth,
