On 9 November 2023 at 1630, you are inbound...

Question 1 of 27070673956e598d45f16831b6d1a

On 9 November 2023 at 1630, you are inbound at Charleston Harbor Entrance Buoy “10” (ACT6611). What is the direction and velocity of the current you are encountering as you pass Buoy “10”? Illustration D058NG

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Question 1 of 27070

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🔍 Key Concepts

• Use only the ACT6611 Buoy 10 (top) current prediction graph, not the Lower Town Creek graph below it • Determine whether the current is flood (positive values) or ebb (negative values) at 1630 on 11/09 • Match the sign of the current (flood/ebb) to the listed mean directions shown at the top of each graph (flood vs ebb directions)

💭 Think About

• On the Buoy 10 graph, is the curve above or below zero at 1630 on 11/09, and is it closer to 0.1 or 0.2 knots? • Once you know if it’s flooding or ebbing, which two answer choices can you immediately rule out based on direction alone? • Compare the graph’s scale on the vertical axis with the curve’s height at 1630—what approximate speed does that correspond to?

✅ Before You Answer

• Confirm you are reading local standard time (LST) along the bottom axis and are exactly at 11/09 16:30, between the 12:00 and 18:00 tick marks • Verify whether the current is positive (flood) or negative (ebb) to select the correct mean direction for that station • Check the speed scale on the left (in knots) and ensure your chosen answer’s speed (0.1 vs 0.2 kts) matches the graph’s value at that moment