SkyTraq PX1175RDP - Page 16

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The formats of the supported NMEA messages are described as follows:
GGA – Global Positioning System Fix Data
Time, position and fix related data for a GPS receiver.
Structure:
$GPGGA,hhmmss.sss,ddmm.mmmmmmm,a,dddmm.mmmmmmm,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11 12
Example:
$GPGGA,072120.000,2447.0913289,N,12100.5212111,E,4,27,0.5,94.715,M,19.600,M,2.000,0000*49<CR><LF>
Field
Name
Example
Description
1
UTC Time
072120.000
UTC of position in hhmmss.sss format, (000000.000 ~ 235959.999)
2
Latitude
2447.0913289
Latitude in ddmm.mmmmmmm format
Leading zeros transmitted
3
N/S Indicator
N
Latitude hemisphere indicator, ‘N’ = North, ‘S’ = South
4
Longitude
12100.5212111
Longitude in dddmm.mmmmmmm format
Leading zeros transmitted
5
E/W Indicator
E
Longitude hemisphere indicator, ‘E’ = East, ‘W’ = West
6
GPS quality
indicator
4
GPS quality indicator
0: position fix unavailable
1: valid position fix, SPS mode
2: valid position fix, differential GPS mode
3: GPS PPS Mode, fix valid
4: Real Time Kinematic. System used in RTK mode with fixed integers
5: Float RTK. Satellite system used in RTK mode., floating integers
6: Estimated (dead reckoning) Mode
7: Manual Input Mode
8: Simulator Mode
7
Satellites Used
27
Number of satellites in use, (00 ~ 12)
8
HDOP
0.5
Horizontal dilution of precision, (0.0 ~ 99.9)
9
Altitude
94.715
mean sea level (geoid), (-9999.9 ~ 17999.9)
10
Geoidal Separation
19.600
Geoidal separation in meters
11
Age pf Differential
GPS data
2.000
Age of Differential
NULL when not in RTK fix or RTK float
12
DGPS Station ID
0000
Differential reference station ID, 0000 ~ 1023
13
Checksum
49