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- Q304 - Navigation General: Great Lakes and Inland
1142. You are to sail from Elizabethport, NJ, on 22 May 1983 with a maximum draft of 28 feet. You will pass over an obstruction in the channel near Sandy Hook that has a charted depth of 27 feet. The steaming time from Elizabethport to the obstruction is 1h 40m. What is the earliest time (ZD +4) you can sail on the afternoon of 22 May and pass over the obstruction with 3 feet of clearance?
To ensure safe passage over a charted obstruction, calculate the required tide height based on draft and clearance, consult tide tables to determine the earliest time the tide reaches that height, and subtract steaming time to find the earliest safe sailing departure.
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