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- Q134 - Navigation Problems: Near Coastal
27. You will be loading in Boston Harbor to a maximum draft of 32'06″. The charted depth of an obstruction in the channel near Boston Light is 30 feet and you wish to have 3 feet of keel clearance. The steaming time from the pier to the obstruction is 01h 05m. What is the latest time (ZD +4) you can sail on 17 May 1983 and meet these requirements?
To ensure adequate keel clearance, the latest safe departure time is calculated by determining the required tidal height at the obstruction, finding the latest time that height is available based on tide tables, and subtracting the steaming time to the obstruction. This results in a departure time of 1728 (ZD +4).
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