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GPS-6020 Operating Manual
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4. Software Interface
The GPS-6020 interface protocol is based on the National Marine Electronics Association's NMEA 0183
ASCⅡ interface specification, which is defined in NMEA 0183, Version 2.2 and the Radio Technical Commission
for Maritime Services (RTCM Recommended Standards For Differential Navstar GPS Service, Version 2.1,
RTCM Special Committee No.104).
4.1 NMEA Transmitted Messages
The GPS-6020 outputs data in NMEA-0183 format as defined by the National Marine Electronics
Association (NMEA), Standard.
The default communication parameters for NMEA output are 4800 baud, 8 data bits, stop bit, and no parity.
Table 4-1 NMEA-0183 Output Messages
NMEA Sentence Description
GPGGA Global positioning system fixed data
GPGLL Geographic position latitude \ longitude
GPGSA GNSS DOP and active satellites
GPGSV GNSS satellites in view.
GPRMC Recommended minimum specific GNSS data
GPVTG Coruse over ground and ground speed
GPZDA Date and Time
4.1.1 Global Positioning System Fix Data (GGA)
Table 4-2 contains the values for the following example:
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18
Table 4-2 GGA Data Format
Name Example Units Description
Message ID $GPGGA GGA protocol header
UTC Time 161229.487 Hhmmss.sss
Latitude 3723.2475 ddmm.mmmm
N/S Indicator N N=north or S=south
Longitude 12158.3416 dddmm.mmmm
E/W Indicator W E=east or W=west
Position Fix Indicator 1 See Table 4-3
Satellites Used 07 Range 0 to 12
HDOP 1.0 Horizontal Dilution of Precision
MSL Altitude 9.0 Meters
Units M Meters
Geoid Separation Meters
Units M Meters
Age of Diff. Corr. second Null fields when DGPS is not used
Diff. Ref. Station ID 0000
Checksum *18
<CR> <LF> End of message termination
Table 4-3 Position Fix Indicator
Value Description
0 0 Fix not available or invalid