I have an iPad Air that works fine with the P3P but I want to buy a dedicated iPad for the aircraft. The Air II seems to be a popular choice but I have heard some folks say they opted for the cellular as they say that the GPS or some such improves the experience of using the iPad with the P3P. Now, if it was using cell triangulation, I could understand it getting more accuracy but I also see folks admonishing users to turn the cell feature off. So, what is the real deal here. Does having the cellular option represent an improvement with regard to operating a P3P? If so, why? TIA!