My wife and I are buying a GPS unit in celebration of the day.

Speaking of which, does anyone own a Nuvi 500? I'm considering one of those, but I need to find one in a store that has some of the add on maps loaded so I can see which maps I would need to get. With my stinkpot, I boat on inland lakes and a couple rivers in WI where it would be nice to have depth charts. I also boat on Lake MI's Green Bay and the Sainte Marie's River between Superior and Huron.