Next week I am going on a charter boat deep sea fishing and will be brining the P4. I have two questions I hope to get some advice on. Is there any concern that we will not have a cell signal out to sea while flying the P4? I think I can just cache the maps of the area the boat will be the night before. Is there anything else I should know about flying without a cell signal? Can someone give me instructions on how to change the home point to my current location, and can this be done without a cell signal? I will take off from the boat and have the P4 follow us while the boat is headed out to sea. Obviously if I were need to use RTH my location will be much different than the recorded home point when the P4 took off. Thanks for any assistance you can offer.