Satnavs are great for riding in big cities you don't know and autorouting helps you when you miss that turn. Same for getting you from A to B the simplest way...which is what most satnavs are designed for.
But my thread here was about using routes in unmapped areas. As it's still riding (unmapped) roads, following a track shouldn't be a problem, simply check GPS at every intersectionand glane down every now and then checking that on track.
But used to routes and seems possible both generating mixed routes in mapsource and download to GPS...just have to buy a Montana :) So will give this a try.
2006 KTM 950 SuperEnduro
2010 KTM 530 EXC-R
2006 Suzuki RM-Z 250
1981 Husqvarna 420 AE