We recently went on a cruise and I was surprised to find that I could not get a lock on GPS while at sea. I can understand if I were using a map program, but I was using GPS Status app to try and find latitude and longitude. The app would see 6 or 7 satellites, but would not lock. Tried this a couple of time. As soon as we docked, three different times, all was sell and a lock was achieved. I have no idea what being at sea has to do with the GPS.