You get underway from the oil terminal at...

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Question 1 of 2066636eea28f7522a1c51b2c4

You get underway from the oil terminal at Marcus Hook, PA, at 0815 ZT (ZD +5) on 20 February 1983, enroute to sea. You will be turning for 11 knots. What is the approximate current when you are abreast Reedy Island?

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Question 1 of 20

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🔍 Key Concepts

• Use of Current Tables for the Delaware River near Reedy Island and Marcus Hook • Correcting the departure time from zone time (ZT) with zone description (ZD) to get the right reference time for the tables • Understanding how flood and ebb relate to the direction of tidal current in that stretch of the river

💭 Think About

• How do you convert the given local time and date (with ZD +5) into the time format needed to enter the tidal current tables for the Delaware River? • Once you find the predicted current at Reedy Island at the correct time, what does a positive vs. negative current value mean in terms of flood vs. ebb? • Considering the time you leave Marcus Hook and your speed (11 knots), about what time will you pass Reedy Island, and how does that line up with the phase of the tide (flood, ebb, or slack)?

✅ Before You Answer

• Be sure you are using the correct day and time in the current tables after applying the ZD +5 correction • Confirm whether Reedy Island is a primary or subordinate station and whether any corrections must be applied to the primary station data • Double-check the sign and direction (flood vs. ebb) and the magnitude of the current at the time you will actually be abreast of Reedy Island before choosing between the similar options

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