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- Q154 - Navigation Problems: Oceans
12. Your draft is 24 feet. You wish to pass over an obstruction near Lovell Island, MA, on 6 May 1983. The charted depth is 22 feet. Allowing a safety margin of 3.0 feet, what is the earliest time after 0200 DST (ZD +4) that this passage can be made?
A minimum of 5 feet of tide is required above the chart datum to provide sufficient under-keel clearance (27 feet total depth) over the 22-foot charted depth, and the earliest this occurs is at 0347.
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