Info about GPX

GPX on wiki: http://ru.wikipedia.org/wiki/GPX

GPXParser: http://sourceforge.net/projects/gpxparser/

How to parse GPX files with SAXReader: http://stackoverflow.com/questions/672454/how-to-parse-gpx-files-with-saxreader

JGPX: https://code.google.com/p/jgpx/