We’ve got US Topo Maps on our GPSr’s so that bit is easy. We would like Memory Map to work too but only have the maps for Florida and California, so set about trying to create our own using Google Maps. This turned out to be easier that we though, using the Google Maps Hack at this link.
There seems to be a lot of Puzzle caches when you first look at the map, but most of them turn out to be simple offset multi’s where you have to walk a specific distance on a specific bearing to find the cache. Nice and easy as our GPSr’s do waypoint projection.
Some of the actual puzzles are a lot trickier and I’ve had to learn about the US Congressional Library, amongst other things, to get the solutions. I bet we don’t have time to find all the ones we’ve solved, but at least we’re prepared, just in case.