This final thesis explains the entire process of tracking vessels. Results are graphically displayed through the created application. The GPS system is described in more details. It is currently the most accurate global positioning system. For comparison, a brief reference to the older positioning system using the GSM technology was made. Technical characteristics of the on board device are given. Positioning and transmission data are shown using the technical specifications of the devices specially designed for the monitoring of vessels movement. The thesis also describes the GPRS and Iridium technologies used for the transmission of data of the vessels movement. In addition to thesis, the web application was created which can be used to graphically display data of the movement. The application code is included in thesis in additional chapters, as well as the example of database table. The software used in the development of application is described. It includes geographic information system ArcGIS for viewing and working with geographic data, script programming language JavaScript, which is used to create application logic, and SQL programming language to manipulate data in a data base. The paper also includes a screen shot of created application with explanations of visual elements on the map and their functions.