| http://www.w3.org/ns/prov#value | - n of the inertial sensing device and a first acceleration, both based on an output of the rotation sensing device, and the processor is programmed to combine the quaternion and the first acceleration and based on the result of the combination to provide, when the device is fastened close enough to the centre of mass of a moving object such as a person, an estimate of vertical displacement, or a de
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