I did do a search on NFZ this time before I posted this question but didn't find the answer I was looking for. I thought I read somewhere that the Typhoon H had built in firmware that would not even allow it to be powered up if it was within ANY NFZ let alone restrict flying to a specified low level. Can someone describe what the real restrictions are and how the 'H' works with them? I apologize if this a repeat question from someone else but I didn't find one as I have read where some individuals seem to be very disturbed by 'newbee' questions being posted.