Ms. Garmin, heheh, my arch nemesis.. will drop me out in the middle of nowhere without batting an eye, LOL..
So, I tried Base Camp at various times for hiking and camper nav, never had any luck with it. It would mark the waypoints and then scatter... user error I'm sure, but it wasn't as simple as everyone said it was, well for me anyway.
So, learned about
RV Trip Wizard as noted above, works great and I believe will create the .gpx files to load. My Ms Garmin is an older unit and I tried several times but didn't work out.
Trip Wiz works like a charm and I just put in the days final and then add stops if Ms Garmin doesn't route the way I want...
Over all it works well, hope that helps a little...