I have only flown my ma2 three or four times but it doesn’t ask me to calibrate compass does it do it automatically?
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Its always safe to recalibrate every flight , and its not auto.
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Personally I never do it unless it prompts me. As long as the home point sets and checks out on the map, all is good.
Mine have been all over Europe and the Middle East with no issues
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All automatic mate, I shouldn’t worry about unless it tells you there’s an error in which case you do the calibration dance and it takes 30seconds 
And when you’ve done it enough try this way… 
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This … and had my MP for over 4 years and travelled all over Europe during that time - and never calibrated the compass once.
If it suggests you should, first of all move your location by 10m or more. There might be some metal object in the ground. Recently I found a railway line that had been covered in tarmac about 50 years ago.
Remember, if you recalibrate because you are somewhere with something causing the message to recalibrate … and then you fly away from that something … you may create a situation where your drone is in the air and now badly calibrated for its surroundings.
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So do these drones have a magnetic compass that can be confused by substantial iron & steel objects?
Is this something we need to be careful to avoid ? Has anyone experimented (in a fairly safe area) to discover if (perhaps the more) advanced drones have this kind of problem ?
Is there a way to turn off the compass sensor if you know you are going to be flying near a steel structure ?
Moved your post to this more relevant thread.
Many thanks ! I suspect it may possibly be the root of that problem, so would it be helpful to leave a copy there with a link to this thread ?