The article describes how to implement part of the tasks of geolocation system and mobile data terminal registration related to servicing tasks by a central node. The entire system consists of two parts. The first part - mobile node, is situated on the side of the user, who uses the mobile data terminal equipped with GPS module and connected to the Internet, e.g. through GPRS system. The second part of the system (central node) is responsible for collecting essential data from the database, processing it, and displaying current position of the device along with additional information (time, speed) on a map from Google Maps resources. The article describes the rules of implementing Google Maps API - programming interface which allows using Google Maps on websites. Google Maps API allows for integrating a fully functional map on a website, including the features for handling events connected with the mobile data terminals geolocation process.