The presented thesis deals with the subject of tracking via GPS and focuses on possibilities of the practical implementation of user tracking system with the help of mobile end user devices. The introductory theoretical part shortly describes the properties and history of the GPS navigation system. It outlines possible development of end user mobile applications on the level of operating systems and mobile web applications. The final theoretical part provides a short outline of properties of tacking systems available in the Czech market. The primary aim of the thesis was to create an application which would enable the tracking of user position via GPS. The practical part describes the selected solution as well as the individual parts of the...