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Articles

1985: Vol. LXII, No. 1

Loran-C Latitude-Longitude Conversion at Sea : Programming Considerations

Submitted
July 31, 2015
Published
2015-07-16

Abstract

To aid programmers of Loran-C latitude-longitude conversion, we : 1. Provide reference to the literature. 2. Compare digital “processings-noise” for several arc-length methods. 3. Discuss some practical aspects of overland signal propagation (ASF) modeling for offshore navigation. Comparisons are made of the precision of arc-length routines as computer precision is reduced. Overland propagation delays (ASF's) are discussed and illustrated with observations from offshore New England. Present practice of Loran-C error budget modeling is then reviewed with the suggestion that additional terms be considered in future modeling.