Watson Industries, Inc.
GGC-E101 Rev A 08/30/2013
12
06
6 satellites being used
1.1
HDOP = 1.1
275.2,M
Altitude = 275.2 Meters
geoidal separation –33.0 meters
-33.0,M
Differential Correction Age= 6.0 seconds
6.0
Reference
Station Identification
0133
Checksum
*7B
$GPGLL Message Format
The $GPGLL consists of a string ASCII characters sent asynchronously at regular intervals. The
string is sent at 9600 baud with eight data bits, one stop bit and no parity. The contents of this
string are formed as follows:
$GPGLL,ddmm.mmmmm,s,dddmm.mmmmm,s,hhmmss.ss,a,i*cc<CR><LF>
1.
The ”$GPGLL” header indicates the start of the data string. This data is followed by a
comma.
2.
“ddmm.mmmmm” is a nine character string representing the Latitude in “dd” degrees,
“mm” minutes, and “.mmmmm” decimal fraction minutes. This data is followed by a
comma.
3.
“s” is a single character representing the Latitude direction. s = N for North Latitude, s = S
for South Latitude. This data is followed by a comma.
4.
“dddmm.mmmmm” is an eleven character string representing the Longitude in “ddd”
degrees, “mm” minutes, and “.mmmmm” decimal fraction minutes. This data is followed
by a comma.
5.
“s” is a single character representing the Longitude direction. s = E for East Longitude, s =
W for West Longitude. This data is followed by a comma.
6.
“hhmmss.ss” is a nine character string representing the Universal time in “hh” hours, “mm”
minutes, “ ss” seconds and “.ss” decimal fraction seconds at the GPS position. This data is
followed by a comma.
7.
“a” is a single character representing the Status. a = A for data valid,
a = V for data invalid. This data is followed by a comma
8.
“i” is a single character representing the Mode Indicator. i = A for Autonomous, i = D for
Differential, i = E for Estimated.
9.
“*cc” is a three character string representing an asterisk followed by a two digit
hexadecimal checksum.
10.
<CR><LF> The string is terminated by a carriage return and Line Feed. There will then be
a short interval with no data transmission before the next string begins.
