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13
4.1.2 GGA – Global Positioning System Fix Data
Purpose
Output time, position and position-fix related data.
Format
$GPGGA,hhmmss.sss,ddmm.mmmm,a,dddmm.mmmm,a,x,xx,xx.x,xxxxx.x,M,xx.x,M,xxx,xxxx
*CS
Example
$GPGGA,083604.883,2446.5254,N,12100.1399,E,1,09,01.0,00155.7,M,16.3,M,,*6E
Output Rate
Programmable using EverMore Binary Message 0x8E and 0x8F.
Field Name Example Unit Description
1 Message ID $GPGGA GGA protocol header
2 UTC Time 083604.883 hhmmss.sss
hour, minute, sec & decimal sec
000000.000 ~ 235959.999
Leading zeros transmitted
3 Latitude 2446.5254 ddmm.mmmm
degree, minute & decimal minute
Leading zeros transmitted
4 N/S Hemisphere Indicator N a, N=north or S=south
5 Longitude 12100.1399 dddmm.mmmm
degree, minute & decimal minute
Leading zeros transmitted
6 E/W Hemisphere Indicator E a, E=east or W=west
7 GPS Position Fix Indicator 1 x
0 = no position fix or invalid
1 = valid fix, SPS mode
2 = valid fix, DGPS, SPS mode
8 # of Satellites Used 09 xx, 00 ~ 12,
Leading zeros transmitted
9 HDOP 01.0 xx.x, Leading zeros transmitted
10 MSL Altitude 00155.7 Meter xxxxx.x
MSL altitude = WGS-84 ellipsoid
height minus geoidal separation.
Currently this field is WGS-84
ellipsoid height
Leading zeros transmitted
11 Unit of Altitude M Meter
12 Geoid Separation 16.3 geoid separation
13 Unit of Geoid Separation M Meter
14 Age of Differential GPS Data second xxx
Time in seconds since last RTCM
SC-104 Type-1 or Type-9 update.
Null when DGPS is not used
15 Differential Reference
Station ID
xxxx, 0000 ~ 1023
Leading zeros transmitted
Null when DGPS is not used
16 Checksum *6E