Proceedings Of The Marine

FALL 2015

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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90 Proceedings Fall 2015 A nswers Deck 1. A. You must sound three short blasts on the whistle. Incorrect answer. B. You must sound one blast if backing to star- board. Incorrect answer. C. You must sound whistle signals only if the vessels are meeting. Incorrect answer. D. You need not sound any whistle signals. Correct answer. Reference: Inland Rule 34 Rule 34(a) states: "When power-driven vessels are in sight of one another and meeting or crossing at a distance within half a mile of each other, each vessel underway, when maneuvering as authorized or required by these Rules: '(i) shall indicate that maneuver by the following signals on her whistle.'" 2. A. Gray lines on the uppermost inset chart. Correct answer. Reference: Pub. 106 – Atlas of Pilot Charts North Atlantic Ocean (including Gulf of Mexico) 2002, National Geospatial-Intelligence Agency B. Red lines on the main body of the chart. Incorrect answer. C. In parenthesis on the lines of equal magnetic variation. Incorrect answer. D. Annual rate of change is not shown. Incorrect answer. 3. A. .19 foot Incorrect answer. B. .42 foot Incorrect answer. C. .64 foot Incorrect answer. D. .87 foot Correct answer. Reference: Stability and Trim for the Ship's Offcer, Fourth Edition, William E. George, p. 167. Where: GG0 = reduction per tank R = ratio of specifc gravity of the liquid in the tank to the liquid the vessel is foating in L = length B = breadth GG 0 = rlb 3 / 420 × Displacement GG 0 = (1.8/1.025)(30)(15) 3 / (420)(968) = 0.437 foot per tank Total reduction = 2 × 0.437 Total reduction = 0.87 foot 4. A. The designed dredging depth of the channel is 28 ft. Correct answer. Reference: United States Coast Pilot 6, 2014 Edition, Page 2, "Federal project depth is the original design dredging depth of a channel planned by the U.S. Army Corps of Engineers and may be deeper than current conditions. For this reason, project depth must not be confused with controlling depth." B. The channel has 28 ft. in the center, but lesser depths may exist in the remainder of the channel. Incorrect answer. C. The maximum depth which may be expected within the limits of the channel is 28 ft. Incorrect answer. D. The least depth within the limits of the channel is 28 ft. Incorrect answer.

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