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- Q134 - Navigation Problems: Near Coastal
422. Your vessel has a draft of 23 feet. On 23 June 1983 you wish to pass over a temporary obstruction near Beaufort, SC, that has a charted depth of 22 feet. Allowing for a safety margin of 3 feet, what is the earliest time after 1600 DST (ZD +4) that this passage can be made?
A draft of 23 feet, a charted depth of 22 feet, and a 3-foot safety margin require a tide height of 4 feet above chart datum for safe passage. Interpolating the tide table for Beaufort, SC, on June 23, 1983, reveals that this condition is met earliest at 1750 DST.
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