Monitoring Dangerous Goods in Container Yard Using the Internet of Things

Table 3

Field meaning of GPGGA message.

GGA	Global Positioning System Fix Data
123519	Fix taken at 12:35:19 UTC
4807.038,N	Latitude 48 deg. 07.038′ N
01131.000,E	Longitude 11 deg. 31.000′ E
1	Fix quality: 0 = invalid; 1 = GPS fix (SPS); 2 = DGPS fix; 3 = PPS fix; 4 = real-time kinematic; 5 = float RTK; 6 = estimated (dead reckoning); 7 = manual input mode; 8 = simulation mode
08	Number of satellites being tracked
0.9	Horizontal dilution of position
545.4,M	Altitude, meters, above mean sea level
46.9,M	Height of geoid (mean sea level) above WGS84 ellipsoid
(empty field)	Time in seconds since the last DGPS update
(empty field)	DGPS station ID number
47	Checksum data, always beginning with