Ivan, I agree with most of what you say, but I have some comments on your post. But let me preface it by saying my comments are based on my understanding of the Phantom, which could be all wrong, partially wrong or completely correct. So if after reading this, please everyone, help me understand where I may be wrong. So here goes: I do believe the home point is saved as you say, but I don't think it is for good. That implies if I fly tomorrow and never get a lock, it will use the lock that was saved the day before. And that actually might happen, or it may not. The storing of this is done in volatile memory that is kept active through either capacitance discharge or a battery or both. I think there is a little battery on the GPS module that serves this purpose. So if you temporarily lose you GPS signal, it recovers your homepoint from memory. But given enough time, that GPS location is lost.