Is there any good ways to get acceleration sensor data without gravity? Like it would use magnetometer to get the orientation and then remove gravity based on it? Some ready made examples.
I would like to calculate 3-4 seconds the speed the watch has and if possible, also a location/orientation.
location will be GPS lat/lon ? It will take you at least 20 seconds to power on the GPS and get a fix and that is assuming you have downloaded AGPS data - otherwise expect 12 minutes for the first fix.
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