Altina GGM308U - Manual (Page 8)

Please note that the Virtual COM Port number might be different from every computer.
Before using navigating software, please confirm the COM Port number created by your
computer and provided by your navigation software. Otherwise, the navigating software
won’t receive the satellite signal, because of the un-match COM Port setting.
5. SOFTWARE DATA
NMEA 0183 V2.2 Protocol
Use RS-232 interface 4800 bps, 8 bit data, 1 stop bit and no parity.
5.1. NMEA Output Message
Table 5-1 NMEA-0183 Output Messages
NMEA Record 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
5.2. Global Positioning System Fix Data (GGA)
Table 5-2 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 5-2 GGA Data Format
8
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