http://en.wikipedia.org/wiki/GPS_eXchange_Format
Gratis program.
http://www.gpsbabel.org/download.html#downloading
http://www.easygps.com/
http://www.youtube.com/watch?v=dLzvg2vnUDM
Garmin GPSMAP 62 tutorials with Jim Cyr
http://www.youtube.com/playlist?list=PL53A8AEE683C995BF
x, y and z as Points, Polyline, Blocks and 3D
Set from Front