American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 54
bution of metal to starboard and to port, as in thecase of a compass placed off the amidship line. 108. D is approximately equal to the mean of the deviations on NE. and SW.;or to the mean of those on SE. and NW., with sign reversed; or to the mean of thosemeans. In the table of deviations given in…
Navigation · Nautical astronomy
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