A hand reference for a control panel of a utility vehicle provides a gripping handle for an operator to adjust controls without observing the controls. The check sleeve includes check-holding mechanism to hold one or more checks in place in the sleeve, and contains various types of markings or other features that allow an image of the sleeve to be oriented, and to allow the portion of the image that represents a check to be distinguished from portions of the image that do not represent a check. The exponent unit includes a first adder to generate S1, where S1 is the sum of an integer k, the exponent of a floating point value A, and the exponent of a floating point value B. The at least one three-dimensional epipolar data structure includes data describing the difference in position of at least one object between the perspectives. A typical section can be around 1000 feet long, 150 feet wide and about 50 feet deep.