I would give the Magellan Explorist high marks for geocaching. I used to have one before I forgot it on my back bumper and drove over it. It is not Ford F-150 proof! The Ford wins every time. I haven't had any direct experience with the iPhone 4 but have read numerous posts and articles about the unreliabiilty of the built-in GPS of any smart phone, not just the iPhone. They may work reasonably well for finding some caches but using a smart phone to hide a cache is a serious mistake. The coordintes are not realiable enough for that and anyone who comes behind with a real GPS looking for a cache at a specific location can be seriously misled and frustrated because the cache was not hidden with a GPS only device. In fact, Groundspeak ought to bring everyone up to date and remind them of the inherant advantages and disadvantages of smart phones for hiding caches. They are no doubt great for locating someone who has gotten themselves lost, has been injured and needs help or broken down on the road. Smart phones are certainly reliable enough for things like that, or for tracking where your kids are going when they leave the house, that is, until they go inside away from GPS coverage.
So please, use your iPhone 4 all you want to find caches. But don't get too frustrated. Break out your Magellan when you want to get serious and please, to not use your smart phone to hide a cache.
