You are to sail from Elizabethport, NJ, 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 26 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?

Question

Accepted Answer

Option A: 0056. Required tide height equals draft (27') plus clearance (2') minus charted depth (26'), equaling 3 feet. Extract high/low data from the tide tables for the date, apply the range-ratio interpolation method, and subtract the 1h 50m steaming time.