On 14/05/2019 17:39, Harry Bloomfield wrote:
It happens that Brian Gaff formulated :
I don't know but I do find often that moving in the garden seems to
effect its detection of north, so I'm guessing its actually quite slow
at detecting things.
Brian

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.

Can't you get the phone to display an analogue clock face, then use the
"boy scout" way relative to the Sun?

--
Max Demian