Sunday after noon i decided to take a strool up to one of dartmoors tors i was pretty close to the granite rock formations and kept getting strong magnetic InterferenceI managed to take off and it seemed the closer i got to the rocks the more the drone would shake a little, Even just above.
I have just read up a little about granite rock & maybe this is whats going on
The crystals of feldspar and quartz which make up the majority of granite are sensitive to the Earth’s magnetic field (the magnetosphere) as they cool. Once they have solidified they contain a snapshot of the polarity and intensity of the magnetosphere which is called a paleomagnetic record. Provided the rocks aren’t contaminated by heat at a later date you can use them to read the strength of the Earth’s magnetic field billions of years ago. Smaller magnetic inclusions (the name given to the crystals) give more accurate results as they are less vulnerable to temperature changes.
The flight was very enjoyable as i wasnt to worried by keeping it low and nothing round me for miles.
The other Thought of the day was i wearing a magnetic copper bracelet.
You can check out my flight from Sunday afternoon 7th may.

nice video