EB-N701 User’s Manual
EverMore Technology Inc.
2F, No.7, R&D Road 1, Science-Based Industrial Park, Hsinchu, Taiwan, 300, R.O.C.
http://www.emt.com.tw
20
5.4 $GPGLL
This message transfers Geographic position, Latitude, Longitude, and time. The $GPGLL message
structure is shown below:
Field Format
Min
chars
Max
chars
Notes
Message ID
$GPGLL
6
6
GLL protocol header.
Latitude Float
1,2.1
3,2.4
Degree * 100 + minutes.
N/S Indicator
Char
1
1
N=north or S=south.
Longitude Float
1,2.1
3,2.4
Degree * 100 + minutes.
E/W indicator
Character
1
1
E=east or W=west.
UTC Time
hhmmss.sss
1,2,2.1
2,2,2.3
Fix time to 1ms accuracy.
Status
Char
1
1
A Data Valid.
V Data invalid.
Mode Indicator
Char
1
1
A Autonomous
Checksum
*xx
(0) 3
3
2 digits.
Message terminator
<CR><LF>
2
2
ASCII 13, ASCII 10.
5.5 $GPGSA
This message transfers DOP and active satellites information. The $GPGSA message structure is
shown below:
Field Format
Min
chars
Max
chars
Notes
Message ID
$GPGSA
6
6
GSA protocol header.
Mode Char
1 1 M
Manual, forced to operate in
selected mode.
A
Automatic switching between
modes.
Mode Int 1 1 1
.Fix not available.
2
2D position fix.
3
3D position fix.
Satellites Used Int
2
2
SV on channel 1.
Satellites Used Int
2
2
SV on channel 2.
… .
..
..
..
Satellites Used Int
2
2
SV on channel 12.
PDOP Float
1.1 3.1
HDOP Float
1.1 3.1
VDOP Float
1.1 3.1
Checksum *xx
0
3
2
digits
Message
terminator
<CR> <LF>
2
2
ASCII 13, ASCII 10
