ABSTRACT
Each GPS receiver sentence starts with the $ symbol. This flag helps to identify beginning of the sentence. Information content of the sentence follows the prefix GPRMC (Garmin). Individual data in the sentence is separated by the “,” (comma symbol, in the ASCII code the value 2Ch). Particular data can be evaluated based on the number of these symbols. As an example we can choose 80 symbols of the GPRMC sentence including the flag. Thus a part of the sentence is stored in the memory of microcomputer. After switching the communication source back to the default state content of the given part of memory may be transferred to the control centre where transaction is being finished and obtained data processed. As a result we can find out if the vehicle goes in a required direction (according to the oriented map), is standing or moving, breaking the speed limit etc.
