I have a Nuvi 500 that I've had for a couple of years now. My question is on loading maps from the Garmin 24k topo maps that come on a DVD. Can I copy the entire disc to a Micro SD chip or do I have to copy sections? I would prefer to work from the DVD mapset instead of buying the topo maps on Micro SD from Garmin (twice as many states). When maps are loaded on the Micro SD, do they show up as an option to select or de-select maps (like the 100k topo and the City Navigator sets do)? Thanks for everyone's time.