EB-N700 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
5.3 $GPGGA
This message transfers global positioning system fix data. The $GPGGA message structure is shown
below:
Field Format Min
chars
Max
chars
Notes
Message
ID
$GPGGA
6
6
GGA protocol header.
UTC Time
hhmmss.sss 2,2,2.3
2,2,2.3
Fix time to 1ms accuracy.
Latitude float
3,2.4 3,2.4
Degrees * 100 + minutes.
N/S
Indicator
char
1
1
N=north or S=south
Longitude float
3,2.4 3,2.4
Degree * 100 + minutes.
E/W
indicator
Char
1
1
E=east or W=west
Position Fix
Indictor
Int
1
1
0: Fix not available or invalid.
1: GPS SPS mode. Fix available.
Satellites
Used
Int
2
2
Number of satellites used to calculate fix.
HDOP
Float
1.1
3.1
Horizontal Dilution of Precision.
MSL
Altitude
Float
1.1
5.1
Altitude above mean seal level
Units
Char
1
1
M Stands for “meters”.
Geoid
Separation
Int
(0) 1
4
Separation from Geoids can be blank.
Units
Char
1
1
M Stands for “meters”.
Age of
Differential
Corrections
int
(0) 1
5
Age in seconds Blank (Null) fields when DGPS
is not used.
Diff
Reference
Corrections
int 4
4 0000.
Checksum
*xx
(0) 3
3
2 digits.
Message
terminator
<CR> <LF>
2
2
ASCII 13, ASCII 10.
