oaconvert is an Open Source command-line tool to convert airspace files in OpenAir format [1] to files in Polish [2], GPX [3] and KML [4] format. [1] http://www.winpilot.com/usersguide/userairspace.asp [2] http://www.cgpsmapper.com/ [3] http://www.topografix.com/gpx.asp [4] https://developers.google.com/kml/