Hydrographical surveying : a description of means and methods employed in constructing marine charts (1920)
Wharton, W. J. L. (William James Lloyd), 1843-1905, Field, Arthur Mostyn, 1855- · London : J. Murray · leaf 125
ide has been calculatedby ordinary trigonometry. We now want to calculate thebearings of the different sides, so as to be able to break upthe triangulation into different sheets. We shall want also 104 HYDROGRAPHICAL SURVEYING [chap. iv. the latitude, and difference of longitude from A, of F,… … We shall commence by calculating the convergency for tenmiles of departure at the average latitude of the chart, as weshall want it directly. Ill this case we fuid that— Convergency for 10 of departure = 11-92.Or for each mile of departure = 1-2. We then find approximate latitude of B by the…
Hydrographic surveying · Nautical charts
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