Programming Manual 10
Table 2-3 GLL Data Message Defined
Field Description
ddmm.mmmmm Latitude in degrees, minutes, and decimal minutes
s s = N or s = S, for North or South latitude
dddmm.mmmmm Longitude in degrees, minutes, and decimal minutes
s s = E or s = W, for East or West longitude
hhmmss.ss UTC time in hours, minutes, and seconds of GPS position
s Status, s = A = valid, s = V = invalid
*cc Checksum
<CR><LF> Carriage return and line feed
2.3 GSA Data Message
The GSA message contains GPS DOP and active satellite information. Only
satellites used in the position computation are present in this message. Null
fields are present when data is unavailable due to the number of satellites
tracked. Table 2-4, breaks down the GSA message into its components. This
message has the following format:
$GPGSA,a,b,cc,dd,ee,ff,gg,hh,ii,jj,kk,mm,nn,oo,p.p,q.q,r.r *cc<CR><LF>
Table 2-4 GSA Data Message Defined
Field Description
a Satellite acquisition mode M = manually forced to 2D or 3D, A = automatic swap
between 2D and 3D
b Position mode, 1 = fix not available, 2 = 2D fix, 3 = 3D fix
cc to oo Satellites used in the position solution, a null field occurs if a channel is unused
p.p Position Dilution of Precision (PDOP) = 1.0 to 9.9
q.q Horizontal Dilution of Precision (HDOP) = 1.0 to 9.9
r.r Vertical Dilution of Precision (VDOP) = 1.0 to 9.9
*cc Checksum
<CR><LF> Carriage return and line feed
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