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GPS Programming & .NET


June, 2004: GPS Programming & .NET
Field Description Format
(a)
1 Universal Time Coordinated (UTC) (Greenwich time) HHMMSS.SSS
2 Latitude DDMM.MMM
3 Hemisphere. North/South N/S
4 Longitude DDDMM.MMM
5 Hemisphere. East/West E/W
6 Fix valid. No fix/Normal fix/DGPS fix 0/1/2
7 Number of satellites in view. 00-12 NN
8 Horizontal dilution of precision (meters) D.DDD
9 Altitude above mean sea level (meters) D.DDD
10 Unit of field 9 M
11 Difference between WGS84 ellipsoid and mean sea level (meters) D.DDD
12 Unit of field 10 M
13 DGPS specific
14 D:o
Sample: $GPGGA,145326.347,5053.7408,N,00436.4477,E,1,03,24.3,112.5,M,,,,0000*30
(b)
Field Description Format
1 Latitude DDMM.MMM
2 Hemisphere. North/South N/S
3 Longitude DDDMM.MMM
4 Hemisphere. East/West E/W
5 Universal Time Coordinated (UTC) (Greenwich time). HHMMSS.SSS
6 Valid/Not valid A/V
Sample: $GPGLL,5917.102,N,01807.157,E,201349,A*23
(c)
Field Description Format
1 Universal Time Coordinated (UTC) (Greenwich time). HHMMSS.SSS
2 Valid/Not valid A/V
3 Latitude DDMM.MMM
4 Hemisphere. North/South N/S
5 Longitude DDDMM.MMM
6 Hemisphere. East/West E/W
7 Speed over ground (knots) D.DDD
8 Direction of movement (degrees) DDD.D
9 Date DDMMYY
10 Magnetic variation (degrees) DDD.D
11 Magnetic variation direction East/West E/W
Sample: $GPRMC,201348,A,5917.102,N,01807.157,E,000.0,360.0,070103,003.3,E*7E
(d)
Field Description Format
1 Direction of movement True North (degrees) DDD.D
2 Type of direction for field 1 T
3 Direction of movement Magnetic North (degrees) DDD.D
4 Type of direction for field 3 M
5 Speed (knots) D.DDD
6 Unit for field 5 N
7 Speed (km/h) D.DDD
8 Unit for field 7 K
Sample: $GPVTG,110.5,T,M,0.89,N,1.7,K*52

Table 2: (a) GGA, GPS fix data; (b) GLL, geographic position (latitude/longitude); (c) RMC, recommended minimum navigation information; (d) VTG, track made good, and ground speed.


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