OpenStreetMap

OpenStreetMap is a collaborativo plan in order to create given maps to free content using from dispositi portable GPS and other free sources to you. The more common source for the data immessi in the OSM is portable units GPS. Many collaborators use programs like GPSBabel in order to convert data GPS from crude format (NMEA) or from an application of the XML forms owners to you to format GPX (). The data, like latitude/longitude, are collected in format WGS84 and are normally visualize to you on the projection of Mercatore.