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Distance-off by Angle of Depression

Published online by Cambridge University Press:  01 January 1969

P. A. Thompson
P. A. Thompson
Affiliation:
(Shell Tankers Ltd.)
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Extract

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Mr. P. H. Sayers (this Journal, 21, 83) proposes a method of finding the observer's distance from a ship, buoy or lighthouse, the height of which is unknown, by measuring the angle between its waterline and the horizon, the angle thus found being reduced for the dip of the sea horizon for the height of eye. Table 1, an enlargement of the table which the author has used for some 15 years, gives the same information. It requires no correction for dip.

Type
Forum
Information
The Journal of Navigation , Volume 22 , Issue 1: Special Issue - 21st year of publication , January 1969 , pp. 141 - 142
Copyright
Copyright © The Royal Institute of Navigation 1969