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[1911]

I have Garmin Topo 2008 loaded on my Nuvi 660 and it works just fine, although you have to turn off "3D View" on the main display for the topos to display there. The worst thing about it (to me) is that the Garmin topos are only 1:100,000 maps (as opposed to the 1:24,000 scale of paper 7.5 minute quads) so you don't get much detail. I guess it's the trade-off for getting the whole country on one disk.

What roads and trails it shows depends on where you are, but again the detail is not great. When I was elk hunting in Colorado last year, it showed county roads and main trails on the 11,000-foot mountain I was on but not all the 4WD trails by any means.

In New mexico and Texas it does not show many trails; it has to be a pretty decent (maintained) dirt road to show up.

To be honest, I'm a little disappointed in mine and don't look at it very much while I'm wheeling - there's just not enough detail to be any real help. I suppose it would do to find your way back to civilization if you were completely lost or snowed in or something, but for wheeling it's not that useful.

I have digital 1:24,000 USGS 7.5 quads on my laptop that I can plug a GPS into when I need the detail and that works super great, but having a laptop in the truck for wheeling is not practical since I don't have a mount for it.