btw - sorry @AndyT - your thread has gone rather magnetic! 
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Haha no worries, all good info 
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Continuing the magnetic interference theme another step, and following up on my comments last evening …
Anticipating my future The Needles Lighthouse exercise, I wanted to explore two things …
a) ability to launch from a steel platform, and
b) the ability to land without stopping the motors, and then take off again, so as to not update the RTH location.
A 10 ton rated manhole cover was my steel platform test … and made no difference. No warnings, etc.
Of course, this doesn’t mean that a MASSIVE steel platform at the intended location won’t cause a problem. More testing needed.
As to the non-motor-stop landing …I disabled the “Precision Landing” and the “Landing Protection” … and, as you can see, it can land without motors turning off (like my P2).
The difficulty, landing on the intended, distant, object is there there’s a very slight window between “landing” and “motors off” during which one needs to release the sticks. More practice needed.
Edit: That’s also 2.5 tons of Shogun ironmongery (with MOT challenging rust!) within 1m to the left.
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