Eg&g, Inc.

James B Andrews

Richard I Scarlet

William F Henning, Ii

A method and apparatus for determining lane count error in a conventional navigational system which gives the position of a vessel in an integer and fractional lane count format but has an inherent integer lane count ambiguity. A second navigational system capable of determining the distance between the vessel and a surveyed transponder or other fixed element is placed on board the vessel. Readings are taken from both the conventional and the second navigational system at at least two separate positions of the vessel. By combining and comparing the data obtained from both systems, an operator can determine the lane count error in the conventional system.

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Nashua, NH, United States of America

James B Andrews