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- Q126 - Navigation Problems: Near Coastal
409. Your vessel has a draft of 24 feet. On 7 April 1983 you wish to pass over a temporary obstruction near Lovell Island, MA, that has a charted depth of 22 feet. Allowing for a safety margin of 3.1 feet under your keel, what is the earliest time after 0100 EST (ZD +5) that this passage can be made?
A draft of 24 feet, a charted depth of 22 feet, and a 3.1-foot safety margin require a total of 27.1 feet of water. Using tide table data and interpolation, the earliest safe passage time is 0342.
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