I'm pretty new to caching, and I wasn't sure yet whether I wanted to fork over the cash for a handheld, so I downloaded Geobeagle on my Droid. It works fairly well, and the closest it's gotten me to GZ so far has been within 8 feet. The only issue that I have with the app, occurs when you are looking at the "radar" screen; the directional arrow may be pointing directly behind you, but the number of feet remaining until you reach GZ is still going down while you're walking forward. Because of this, I ignore the arrow most of the time, and just watch the numbers. It hasn't prevented me from making a find yet.