American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 64
ss or pelorus, taking one as quickly as possible after the other; see thatthe ship is on an even keel at the time the observation is made, and, if using thepelorus, be sure also that she heads exactly on the course for which the pelorus is set.Correct the bearings so that they will be either true… … PILOTING. 57 only to obtain the magnetic; if observed by pelorus, that instrument should be setfor the true or magnetic heading, according as one or the other sort of reading isrequired, and no further correction will be necessary. Draw on the chart, by meansof the parallel rulers, lines which…
Navigation · Nautical astronomy
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