On Tue, Apr 8, 2014 at 3:14 PM, Martin Koppenhoefer <dieterdre...@gmail.com> wrote: > > >> Am 08/apr/2014 um 11:45 schrieb François Lacombe >> <francois.laco...@telecom-bretagne.eu>: >> >> Common devices like smart phones carry compass captors, used by compass >> applications. >> These captors only sense the magnetic north to determine the azimuth of the >> device. The magnetic north is continuously diverting from the geographic >> north. > > > on iPhones you can change this in settings (geographic vs magnetic north) not > sure for other devices but my guess is there will be settings as well... > For the two Android I ever used, the compass is useless for more than N-S-E-W orientation. You can get data precise to the degree, but even with phone lying on a table, with nothing metallic moving around, it's fluctuating, sometimes more than 50 degree about. Worthless in my opinion.
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