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Distance by Vertical Angle

Published online by Cambridge University Press:  18 January 2010

Charles H. Cotter
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The note by V. L. Bosazza (on page 112) raises a number of interesting points. First it must be noted that there is no indication in Ryder's book that the horizon method, viz. ‘To observe from the cross-trees or other convenient place the angle subtended between the horizon and the enemy's waterline’, was used before it was introduced by Ryder in 1845. Ryder remarked that in not a single man-of-war which he visited before the time of the publication of his book did he find any method in use that would denote satisfactorily the range of a ship at sea; and it was to meet this deficiency that he suggested his horizon method.

Type
Forum
Information
The Journal of Navigation , Volume 25 , Issue 1 , January 1972 , pp. 109 - 111
Copyright
Copyright © The Royal Institute of Navigation 1972

References

REFERENCES

1Ryder, A. P. (1845). Methods of Ascertaining the Distancefrom Ships at Sea. London.Google Scholar
2 Mackenzie, Murdoch, Senior (1774). Maritime Surveying. London.Google Scholar
3Ritchie, G. S. (1967). The Admiralty Chart. London.Google Scholar
4Shortland, P. F. (1890). Nautical Surveying. London.Google Scholar
5Raper, H. (1840). The Practice of Navigation. London.Google Scholar
6Cotter, C. H. (1964). The Complete Coastal Navigator. London.Google Scholar
7Cluett, S. L. (1931). Determination of offshore position by sextant altitude of mountain peak. U.S. Naval Institute Proceedings. Annapolis. (See also International Hydrographic Review (1936), 13, 142.)Google Scholar