G. D. Dunlap

Peer Reviewed

Abstract: Incidentally, during this study, I found that the first sight, made in a string, was apt to have greater error than subsequent ones. In my own case, using a 6X power telescope and the degree of shading I employ, I would select the appropriate value for refraction given by Dr. Clemence, and increased by 0.5’. If there were indications that a temperature inversion existed, I would bear in mind that the refraction might be 2.0’, more or less greater than the tabulated value. But on most of the ocean’s navigable surface, and under any but most unusual weather conditions, I would be confident that my true position lay less than 2 miles from the resulting line of position.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 4, Number 2
Pages: 91 - 94
Cite this article: Dunlap, G. D., "VISUAL RADIO DIRECTION FINDING", NAVIGATION: Journal of The Institute of Navigation, Vol. 4, No. 2, 1954, pp. 91-94.
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