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?

Correct Answer: Option A — 1750

Required depth equals draft (23 ft) plus safety margin (3 ft) minus charted depth (22 ft), demanding 4 feet of tide. Using tide tables near Beaufort, SC, find the earliest time after 1600 DST when the tide reaches at least 4.0 feet, which is 1750.