In article 4b91affc-991a-4ad0-9e88-aafb62be4738
@googlegroups.com, says...

On Tuesday, 14 May 2019 13:39:03 UTC+1, Harry Bloomfield wrote:
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 probably works on GPS principles.
It won't know which way North is until you move it around.

If I reverse into a parking space, my SatNav thinks I've
turned round!

--

Terry

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