I went to a different site to fly today. The site is about 1 mile as the crow flies from my home. I got a compass calibration err. So I did the Calibration and it did not take. I tried it about 10 more times and still no calibration. I walked about 50 feet away from my car and went in 4 different directions and no calibration. When I look at the NFZ map I was close but didn't think that was the problem. So I packed up and drove about 3 miles to the high school. Same problem. But this time it was almost locking in. So up I go again to the Jr. High School. Turned everything on and no calibration required at all. The high school is also close to the NFZ. So my question is is this the way DJI is keeps us from flying in a NFZ? As a side note I drove about 10 miles away from the NFZ and again no problem. I thought from what I have read is that you could not start your motors. Not so with me. Would like to know if anyone else has had this happen to them.