Proceedings Of The Marine

SPR 2016

Proceedings magazine is a communication tool for the Coast Guard's Marine Safety & Security Council. Each quarterly magazine focuses on a specific theme of interest to the marine industry.

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67 Spring 2016 Proceedings www.uscg.mil/proceedings A nswers Deck 1. A. a vessel engaged in fshing, at anchor Incorrect answer. B. a vessel restricted in its ability to maneuver, at anchor Incorrect answer. C. a sailing vessel, at anchor Correct answer. "A vessel at anchor shall at intervals of not more than 1 minute ring the bell rapidly for about 5 seconds." Reference: International and Inland Rule 35(g). D. all of the above Incorrect answer. 2. A. 063° Incorrect answer. B. 068° Incorrect answer. C. 073° Incorrect answer. D. 079° Correct answer. Where: A = "The angular difference between the target vessel's true course and the true bearing of your vessel from the target vessel." A = 133° – (42° + 180°) A = 89° (make this value positive for calculator solution) Target speed = 6 knots Own vessel speed = 10 knots Sin of the intercept angle = (target speed × sin A) ÷ (your speed) Sin intercept angle = (6 × sin 89°) ÷ (10) Intercept angle = 36.86° True course to steer = intercept angle (±) target bearing (positive if target bearing falls to the right, and negative if target bearing falls to the left) True course to steer = 36.9° + 42° = 78.9° Reference: Richard M. Plant, Formula for the Mariner, 2 nd Ed., p. 32. 3. A. The anchor cable should be veered enough to allow the towline connection to be just forward of your bow. Incorrect answer. B. The anchor cable should be veered enough to allow the towline connection to be immediately astern of the towing vessel. Incorrect answer. C. The strain of the tow is taken by the riding pawl, chain stopper, and anchor windlass brake. Correct answer. "If the anchor cable is used, the hawser is secured or shackled to it and the cable veered away to the desired length; the windlass brakes are then set up and springs or chain stoppers used to take the real strain of towing." Reference: John V. Noel, Jr., Knights Modern Seamanship, 17 th Ed., p. 303. D. The anchor cable should be led out through a chock, if possible, to avoid a sharp nip at the hawsepipe lip. Incorrect answer. 4. A. You can move the belly up in a mainsail by easing the luff tension. Incorrect answer. B. A high-aspect ratio Marconi mainsail is more effcient for downwind sailing than a gaff- rigged mainsail. Incorrect answer. C. You can reduce the belly in a boomed mainsail by easing the sheet. Incorrect answer. D. You should put more belly in a sail in light airs than in a strong breeze. Correct answer. "A slack foot introduces more belly into the sail, especially in the lower part of the sail. This is desirable for light winds, when the airfow can remain attached (laminar) over a deeper curve than in stronger winds." Reference: G. Andy Chase, Auxiliary Sail Vessel Operations, p. 55.

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