True position calculator (GD&T)

Position from measured X/Y deviations, with MMC bonus tolerance and pass/fail.

True position is the diameter of the circle, centred on the exact location, that just contains the measured centre: 2 x the square root of (X deviation squared + Y deviation squared). With MMC on the drawing, the tolerance grows by however far the feature's actual size has moved away from its maximum material size: a hole that came out larger, or a pin that came out smaller, gets that much extra position tolerance. Use any one unit for every box.