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Next Generation GPS 32-Channel Bluetooth GPS BT-Q880 Operating Manual
QSTARZ Technology Inc. 6F-2, No. 160, Ming Chuan E. Road, Sec. 6, Taipei,Taiwan
Tel: ++886 2 2792 0061 Fax: ++886 2 2792 0062 E-Mail: Sales@Qstarz.com Web: www.Qstarz.com
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Appendix A Software Interface
The BT-Q880 interface protocol is based on the National Marine Electronics Association’s NMEA0183 ASCII
interface specification, which is defined in NMEA0183, Version 2.2 and the Radio Technical Commission.
A.1 NMEA Transmitted Messages
The BT-Q880 outputs data in NMEA-0183 format as defined by the National Marine Electronics Association
(NMEA), Standard.
Table A-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 Course over ground and ground speed
A.1.1 Global Positioning System Fix Data (GGA)
Table A-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 A-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 5-3
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 A-3 Position Fix Indicator
Value Description
0 0 Fix not available or invalid
1 GPS SPS Mode, fix valid
2 Differential GPS, SPS Mode, fix valid
3 GPS PPS Mode, fix valid
A.1.2 Geographic Position with Latitude/Longitude (GLL)
Table A-4 contains the values for the following example:
$GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C
Table A-4 GLL Data Format