1. A system for continuously determining parameters representing an orientation of an object in movement, said object subject to a first vector field from a gravitational field of the Earth and a second vector field from a magnetic field of the Earth, said fields having predetermined directions in a fixed coordinate system not linked to the object, said system comprising: a motion-capture device comprising a triaxial accelerometer and a triaxial magnetometer, configured to be coupled to said object, for measuring components of said respective first and second vector fields along axes of said sensors to obtain a gravitational measurement vector and a magnetic measurement vector, and a processor for determining said parameters representing the orientation of the object, wherein said processor for determining said parameters comprises at least: a correction module, which can be deactivated on command, configured to utilize the gravitational measurement vector and the magnetic measurement vector to provide a first corrected vector corresponding to the gravitational measurement vector and a second corrected vector corresponding to the magnetic measurement vector, wherein the first corrected vector is the gravitational measurement vector with any associated corrections and the second corrected vector is the magnetic measurement vector with any associated corrections; and a calculation module configured to calculate a third vector which is not coplanar to a plane formed by the first corrected vector and the second corrected vector, and to utilize the first corrected vector, the second corrected vector, and the third vector to obtain the parameters representing the orientation of the object; wherein the parameters representing the orientation of the object are used for positioning or operation of the object or another object.