| CPC G01P 15/18 (2013.01) [G01D 5/145 (2013.01); G09F 9/301 (2013.01); G01D 1/16 (2013.01)] | 19 Claims |

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1. A device, comprising:
a first component including:
a first user interface; and
a first sensor unit including a first accelerometer, a first gyroscope, and a first processor, the first processor configured to determine a first orientation of the first component based on measurements by the first accelerometer and the first gyroscope;
a second component coupled to the first component and configured to fold onto the first component, the second component including:
a second user interface; and
a second sensor unit including a second accelerometer, a second gyroscope, and a second processor, the second processor configured to determine a second orientation of the second component based on measurements by the second accelerometer and the second gyroscope; and
a third processor configured to estimate an angle between the first component and the second component based on the first orientation and the second orientation.
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