The book is devoted to the description of satellite radio navigation systems GPS-NAVSTAR (USA) and GLONASS (Russia) and their use in various systems for determining coordinates. The book contains brief information from geodesy, necessary for understanding the tasks solved when determining the location of various objects, and a description of the navigation programs OziExplorer, NAVITEL NAVIGATOR, GIS Russa, PocketGPS Pro, PalmGISGPS, etc., widely used in portable and pocket computers, communicators and navigators with the function of taking into account the road situation (including traffic jams), as well as the popular map editor MapEdit for creating your own maps (including routable ones) and presenting them in various map formats.