| http://www.w3.org/ns/prov#value | - Optionally, the compass sensing device or sensor 20 may comprise a two-axis sensor (comprising two magneto-responsive sensing elements disposed at a fixed angle relative to each other, such as orthogonally to each other, and disposed on a platform or circuit board or substrate 32 so that they are positioned generally parallel to the floor plane of the vehicle so as to be sensitive to the horizonta
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