3 ms·
It must require you to be moving in a straight line; otherwise you have just one parameter, the angle of the magnetic field, and there is no way for that one pa
by asmithmd1 14y ago
It must require you to be moving in a straight line; otherwise you have just one parameter, the angle of the magnetic field, and there is no way for that one parameter to specify your location in 2 dimensional space.
- rrmm 14y agoI would guess they would have to use the accelerometers and gyros on the phone to get a plane curve, along which they would then have the gradient and could match against a stored database.