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Part 6 – AT Commands for GPS-Enabled Devices Chapter 16 – AT Commands for GPS-Enabled Devices
Universal IP AT Commands Reference Guide (Document S000457K) 99
SUPPORTED MESSAGE LIST
The following NMEA messages are supported.
Sentence
Descriptions
GGA
Global Positioning System Fix Data
GLL
Geographic Position – Latitude/Longitude
GSA
GNSS DOP and Active Satellites
GSV
GNS Satellites in View
RMC
Recommended Minimum Specific GNSS Data
VTG
Course Over Ground and Ground Speed
NMEA MESSAGES
The full descriptions of supported NMEA messages are provided at the following paragraphs.
GGA – Global Positioning System Fix Data
Time, position and fix related data for a GPS receiver.
Structure:
$GPGGA,hhmmss.sss,ddmm.mmmm,a,dddmm.mmmm,a,x,xx,x.x,x.x,M,,,,xxxx*hh<CR><LF>
Example:
$GPGGA,111636.932,2447.0949,N,12100.5223,E,1,11,0.8,118.2,M,,,,0000*02<CR><LF>
Name
Example
Description
Message ID
$GPGGA
GGA Protocol Header
UTC Time
111636.932
UTC of position in hhmmss.sss format, (000000.000 ~
235959.999)
Latitude
2447.0949
Latitude in ddmm.mmmm format
N/S Indicator
N
Latitude hemisphere indicator, ‘N’ = North, ‘S’ = South
Longitude
12100.5223
Longitude in dddmm.mmmm format
E/W Indicator
E
Longitude hemisphere indicator, 'E' = East, 'W' = West
GPS quality
indicator
1
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
Satellites
Used
11
Number of satellites in use, (00 ~ 12)
HDOP
0.8
Horizontal dilution of precision, (00.0 ~ 1023)
Altitude
118.2
Antenna Altitude above/below mean sea level (geoid), (-9999.9 ~
17999.9)
Units
M
Unit of antenna altitude (meters)
Null
,,
Field not available on GPS cards
Null
,,
Field not available on GPS cards
DGPS
Station ID
0000
Differential reference station ID, 0000 ~ 1023 (NULL when DGPS
not used)
Checksum
02
<CR><LF>
<CR><LF>
End of message (termination)