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?
Official USCG Answer & Rule Citation
Correct Answer: Option D — 0347
Required tide equals draft (24') plus 3 feet clearance minus charted depth (22'), equaling 5 feet. Interpolate the Boston tide tables for 6 May 1983 to find when the rising tide reaches 5 feet after 0200 DST.
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