cbrn:RelativeLocationAzimuthValue

A horizontal bearing angle with respect to True North from a reference point (Origin) to an object (i.e., instrument, detector, or item) or a nuclide.  Its value is the angle subtended by the projection onto the horizontal plane of a straight line from the reference point to the center of the object or nuclide, and a line extending in the forward direction from the reference point. The angle range is from "-180.0" to "+180.0" degrees. A value of zero implies the center of the object or nuclide's body is aligned directly in front of the reference point; positive values imply the object or nuclide is to the right of the reference point; negative values imply the object or nuclide is to the left of the reference point.