Using Evolutionary Computation on GPS Position Correction

Table 1

Fifteen fields of GPGGA sentence.

Number	Meaning
1	UTC of position
2	Latitude
3*	N or S
4	Longitude
5*	E or W
6*	GPS quality indicator; 1: invalid; 2: GPS fix; 3: dGPS fix
7	Number of satellites in use
8	Horizontal dilution of position
9	Antenna altitude above/below mean sea level (geoid)
10*	Meters (antenna height unit)
11	Geoidal separation
12*	Meters (units of geoidal separation)
13*	Age in seconds since last update from differential reference station
14*	Differential reference station ID
15*	Checksum

∗Removed features.