Your vessel will be docking at Chester, PA, during the evening of 22 April 1983. The chart shows a depth of 20 feet (6.1 meters) at the pier. What will be the depth of water available at 1856 EST (ZD +5)?

Correct Answer: Option B — 23.4 feet (7.2 meters)

Tide table interpolations for Chester, PA, at 1856 EST require calculating intermediate height using the duration of rise or fall method, adding the resulting tide height to the 20-foot charted depth.