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- Q141 - Navigation Problems: Near Coastal
57. Your vessel has a draft of 34 feet. On 8 October 1983 you wish to pass over an obstruction near Jaffrey Point, NH, that has a charted depth of 31 feet. Allowing for a safety margin of 3 feet, what is the earliest time after 0900 DST (ZD +4) that this passage can be made?
A draft of 34 feet, a 3-foot safety margin, and a charted depth of 31 feet require a tide height of 6 feet above chart datum for safe passage. Interpolating the tide tables for October 8, 1983, at Jaffrey Point, NH, indicates this height is reached at 1029 DST.
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