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- Q126 - Navigation Problems: Near Coastal
25. You are to sail from Elizabethport, N.J., on 17 November 1983 with a maximum draft of 27 feet. You will pass over an obstruction in the channel near Sandy Hook that has a charted depth of 25.5 feet. The steaming time from Elizabethport to the obstruction is 1h 50m. What is the earliest time (ZD +5) you can sail on 17 November and pass over the obstruction with 2 feet of clearance?
To ensure 2 feet of clearance over a 25.5-foot obstruction with a 27-foot draft, a minimum tide height of 3.5 feet above chart datum is required. Consulting tide tables, this height is reached at 0311 (ZD +5) at the obstruction; therefore, the earliest safe departure time from Elizabethport, accounting for a 1 hour 50-minute steaming time, is 0121 (ZD +5).
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