🔍 Key Concepts

• Use the ACT6611 Fort Sumter Range, Buoy 10 panel, not the other station • Relate positive vs. negative speed values on the graph to flood vs. ebb current and then to the listed mean directions • Interpolate the speed at 10 Nov, 0130 between the printed hourly marks on the time axis

💭 Think About

• Which of the two plots applies to Charleston Harbor Entrance Buoy 10, and how do you know from the station ID in the heading? • At 10 November 0130, is the curve above or below the zero line, and is it closer to the previous or next time tick? What approximate speed does that suggest? • Once you know whether it is flood or ebb at that moment, which mean direction (given at the top of the panel) should you associate with that sign of the current?

✅ Before You Answer

• Confirm you are reading from the upper graph for ACT6611 Buoy 10, not the lower one • Verify whether the current at 0130 on 10 November is flood (positive) or ebb (negative) on the speed axis • Check that your chosen answer matches BOTH the approximate speed on the curve and the correct flood/ebb direction printed at the top of that same graph