We just started geocaching a little over a month ago, using a Garmin Nuvi 260W. It worked well enough for us to find 50 caches our first month, but I decided to buy a Garmin eTrex Venture HC specifically for caching. Now we have both units when we go out and the eTrex is a lot more accurate and quicker for me to use. We got a really good deal on the eTrex through Amazon.com. I think you will be happier with an eTrex or similar unit rather than one designed for automobile use.