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