Not sure if it is BaseCamp or My Nuvi 1460 but of them su...stinks!!!!!
I have made a couple of routes and sent them to the unit and the unit freezes or shuts off. This weekend, made three routes, one was OK the other two froze or shut the unit off. Then, tried to delete them and the same thing happened. No way to even get rid of the of the "corrupt" files. The only way I was able to get rid of them was to reset the unit.
By the way, this does not happen with Mapsource.