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 65
nce run is therefore equal to the distance fromthe object. When the angular distance on the bow at thesecond bearing is twice as great as it was at the first bearing,the distance of the object from the ship at second bearing isequal to the run, the multiplier being 1.0. For if, in figure 18,when… … a. 0 FIG. 18. Or, since the angles at O and A are equal to each other, the sidesOP and AP are equal or the distance at second bearing is equalto the run. This is known as doubling the angle on the low. 146. A case where this holds good is familiar to everynavigator as the ~bow and beam bearing,…
Navigation · Nautical astronomy
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![An illustration from The English pilot. [cartographic material] : The fourth book. Describing The West-India navigation, from Hudson's Bay to the River Amazones. Particularly delineating The Sea Coasts, Capes, Headlands, Rivers, Bays, Roads, Havens, Harbours, Streights, Rocks, Sands, Shoals, Banks, Depths of Water, and Anchorage, with all the Islands therein, as Jamaica, Cuba, Hispaniola, Barbadoes, Antigua, Bermudas, Porto Rico, and the rest of the Caribbee and Bahama Islands. Also, A new Description of Newfoundland, New England, New York, East and West New- Jersey, Dellawar Bay, Virginia, Maryland, Carolina. showing, The Courses and Distances from one Place to another; the Ebbing and Flowing of the Sea, the Setting of the Tides and Currents, &c. With many other Things necessary to be known in Navigation. (1775)](https://img.insideoutlibrary.com/img/200/ia-englishpilotcart00thor-16-39.webp)
