I have read that the Iphone uses a magnetic compass, which suggests it
would be affected by very local magnetic fields, but putting a magnet
close to my SE doesn't seem to affect it at all. What am I missing?
It's magic [tm]
It's probably doing an AI job on you, and possibly cancelling out your
deliberate field interference when compared with other sources (GPS,
skyhook) of information - which probably has a few vectors valid within
a time window.
Should be able to fool it though. Keep trying, say - turn off the
wireless comms? or sweeping your magnet across slowly.
That makes some sense. I guess it is using a mix of magnetic and gyro/
motion sensor, to work out a bearing, which is causing a lag in
response to a magnet. The thing is, it keeps showing upto 90 deg out on
a bearing on the compass. I do have a magnet close to where I charge
it, one I was using to check its response to a magnet.
So long term it uses magnetic field, short term it uses its gyro.
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