OziExplorer maps GPS and works with Garmin, Lowrance, Magellan, Eagle, Brunton..
Create waypoints, routes and tracks on maps and upload to your GPS device.
Active GPX Route Player for Google Earth is the Media Player of GPS playback.
GPS2WorldWind . Create and display tracks, routes and waypoints
For OziExplorer that allows a waypoint to be added by pressin only a key
