Patent ID: 7958644
Filing Date: 2011-06-14
Classification: G01C,H04M

Abstract:
1. A device comprising: a first part having user input means and comprising a three-degrees-of-freedom orientation sensing system for determining a three-degrees-of-freedom orientation of the first part with respect to a reference coordinate frame (XYZ) defined by the earths gravity field (Fg) and magnetic field (Fm), a second part comprising a display for displaying orientation information on a three-degrees-of-freedom orientation of the second part, and sensing means for sensing an one-degree-of-freedom or a two-degrees-of-freedom orientation of the second part, and means for calculating the three-degrees-of-freedom orientation of the second part from the three-degrees-of-freedom orientation of the first part and the one-degree-of-freedom or the two-degrees-of-freedom orientation of the second part, and means for generating the orientation information in response to the calculated three-degrees-of-freedom orientation of the second part to obtain correct display of the orientation information independent on an orientation of the second part with respect to the first part.