Couple of days ago I was standing on the Ocean Beach Pier in San Diego. I pulled out the iPhone and tapped on Altimeter just for fun. There I was, about 25 feet above the ocean water and Altimeter was saying that my altitude was over 700 feet! I waited, and then Altimeter asked if it could use my current location. Well, Duh! Why would I want the altitude at some other location? So I tapped OK. It then recalculated and told me I was at 274 feet altitude. OK, closer, but still 250 feet off my actual altitude. So what is going on here? I waited a few more minutes, but Altimeter still insisted that I was 250 above my own head! But I did not feel like I was flying.