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Distance by Vertical Angle

Published online by Cambridge University Press:  01 July 1971

Charles H. Cotter
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Since the appearance of the note by Sayers in 1968, followed by the publication of the table by Thompson in 1969, and having myself described the method which was the subject of Sayers' and Thompson's communications, in a work on seamanship in 1962, I have searched for the origin of the method whereby an observer may find his distance off a ship or floating mark by means of a sextant observation of the vertical angle between the visible or sea horizon and the waterline of the ship or mark whose distance off is required.

Type
Forum
Information
The Journal of Navigation , Volume 24 , Issue 3 , July 1971 , pp. 420 - 421
Copyright
Copyright © The Royal Institute of Navigation 1971

References

REFERENCES

1Sayers, P. H., (1968). Distance by vertical angle. This Journal, 21, 83.Google Scholar
2Thompson, P. A., (1969). Distance-off by angle of depression. This Journal, 22, 141.Google Scholar
3Cotter, C. H., (1962). The Master and His Ship, London.Google Scholar
4Lecky, S. T. S., (1890). The Danger Angle and Off-Shore Distance Tables, London.Google Scholar
5Moxly, S. H. S., (1941). Coastal Tables for Use in Sight of Land, Glasgow.Google Scholar
6Ryder, A. P., (1st Edn 1845, 2nd Edn 1854, 3rd Edn 1858). Methods of Ascertaining the Distance from Ships at Sea. London.Google Scholar