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?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 0342
Draft (24') plus safety margin (3.1') minus charted depth (22') establishes a required tide height of 5.1 feet. Using Boston tide tables, interpolate the rising tide curve after 0100 EST to find when the water level reaches 5.1 feet.
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