1. A method of determining a position of an object comprising the steps of: (a) producing a plurality of hyperbolic electromagnetic wave patterns; (b) calculating from said patterns at least three lines of position each of which is defined by a lane; (c) identifying a lane of each of said lines of position by two independent techniques; (d) comparing a size of a first area enclosed by lines of position based on the lanes identified by a first of said techniques with a size of a second area enclosed by lines of position based on the lanes identified by a second of said techniques and producing therefrom an indication as to whether the lanes identified by the first technique are more likely to be correct than those identified by the second method; and (e) computing the position of the object using the lines of position based on the lanes identified as being more likely to be correct.