I dunno.. I can count on one hand the number of times I've used .gpx files for navigation. I do almost all my planning on the device (usually CoPilot) so I don't need a computer. The last few multi-day trips I've taken, I just left my laptop at home and use my phone & tablet. And paper maps! Been doing it this way since '05 when I started using a Windows mobile PDA for navigation. I think people who come from the Garmin world have a different perspective, having to use their desktop software for planning because doing it on the Garmin just sux (so I hear!).. If I want to follow a .gpx (usually from another source), I just load it into Locus and run with that, or convert it to a .trp file (CoPilot format). Having said this, it would be nice if CP would include that function..