Abstract: A navigation system provides pose, i.e., location and orientation, solutions using best available location information from two or more location systems. One of the location systems is a fiducial-based location system, which is accurate when a sufficient number of fiducials is recognized. However, when an insufficient number of fiducials is recognized, an odometry-based location system is used. Although the odometry-based location system is subject to drift, when a sufficient number of fiducials is recognized, the fiducial-based location system is used to correct the odometry-based location system. The navigation system provides robust, accurate and timely pose solutions, such as for augmented reality (AR) or virtual reality (VR) systems, without the time-consuming requirement to establish and localize many fiducials or the computational and memory requirements of pure fiducial-based location systems, and without the inherent drift of pure odometry-based location systems.

Abstract: A recessed lighting unit that includes an adjustable lamp holder assembly, a fixture housing within which the adjustable lamp holder assembly is mounted; and a modular trim assembly, wherein the adjustable lamp holder assembly includes a pivot bracket detachably mounted in the fixture housing with a bolt that may be loosed and tightened for selected rotatable adjustment about a horizontal plane, and a vertical portion with a gear knob having a shaft disposed through an arcuate gear knob slot, and operatively connected to spur gear in mesh with gear teeth on an arcuate portion of a lamp support bracket, such that rotation of the gear knob rotates the lamp support bracket in a vertical plane.