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 49
ROR. with North and continumg around to the right; it is also divided into 360 degrees,which are appropriately marked. To obtain a complete curve, a sufficient number of observations should be takenwhile the ship swings through an entire cucle. Generally, observations on everyalternate 15° rhumb… … The curve shown in tlie full Une on figure 9 corresponds to the table of deviationsgiven in article 93. FroTYi a given comjjass course to find the corresponding magnetic course, through thepoint of the vertical fine representing the given compass course draw a line parallelto the dotted lines until…
Navigation · Nautical astronomy
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