I am currently using the Palm Pre (best phone I've ever owned) with "Go To Tool Lite", it is available from the app downloads on the Pre. It gives you a compass that will direct you to the cache, a satellite view, detail of the cache, and allows you to log your find from the app. There is also "Geocache Locator" from Precentral.net, it is going to be harder to install. You need to be pretty technically savy to get it installed. The Go to Tool Lite works like a charm and is easily installed.