The mariners' handbook; a convenient reference book for navigators, yachtsmen, and seamen of all classes (1906)
International Correspondence Schools, Roden, Ernest Konrad, 1866-, International Correspondence Schools. Pocketbook · Scranton, Pa. : International Textbook Co. · leaf 143
he object is then equal to the distance run in theinterval between the first and second bearing, or, the differ-ence of readings of the patent log at the two bearings. By using this method when the object bears 2 or 3 pointsoff the bow, the distance of vessel from A is known beforethe object is… … Fig. 1 TERRESTRIAL NAVIGATION 111 of ship from A is then 74.2 — 69.6 = 4.6 mi. In other words,B D = D A; also, incase C and E are considered, C E = E A.This method is frequently used when the ship is at D, orwhen object bears 4 points off the bow, and is then knownas 4-point bearing. Doubling this…
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