Abstract: A kind of feasible arithmetic is introduced to develop serial procedures for parsing and capturing GPS data information from GPS receiver based on Visual Basic language. Available GPS sentences and field values are pick-up and analyzed. And dynamic or static single-point (non-differential) GPS module positioning data information is captured. Thereinto, the $GPGGA sentence and $GPRMC sentence are analyzed in detail, and the fields values of these two statements are parsed to show the GPS location information. The GPS information, which includes latitude and longitude coordinates based on WGS-84, altitude, speed, time, direction of movement and so on, is displayed on the window interface. Tests show that the system is running with stable, simple, accurate and high real-time.

Key words: GPS, WGS-84, VB, MSComm control