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- Q134 - Navigation Problems: Near Coastal
5. The charted depth alongside the south face of Mystic Pier, Charlestown, MA, is 35 feet. Your maximum draft is 38 feet. You wish to have 2 feet under the bottom, on a rising tide, when you go alongside to discharge a heavy lift. What is the earliest time after 0900 EST (ZD +5), on 2 February 1983, that you can dock?
The correct docking time is 1137 because that is the earliest time the tide reaches a height of 5 feet above chart datum, providing the necessary 40 feet of water depth for a 38-foot draft and 2 feet of under-keel clearance. This requires using tide tables and interpolation to determine the time on the rising tide.
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