Streetpilot is primaraly ment for urban navigation but it is not possible to load a PC-made track or route into it like we are used to do with mapSource (I still prefer that) or BaseCamp.
What I am looking for is a solution like nRoute but capable of running the latest map file and using it in, for instance, the desert of Morocco.
Of course there's Quavadis, Fugawi, Ozieplorer and such but they are all not fully capable of using Garmin files. Plus I find it (too) complicated.
If I would have a lot of time I would dive into that direction.