On 10 November 2023 at 2030, you are inbound...

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Question 1 of 20673956e598d45f16831b6cf6

On 10 November 2023 at 2030, 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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🔍 Key Concepts

• Use the correct station: ACT6611 Fort Sumter Range, Buoy 10 (top graph), not the Lower Town Creek Reach station (bottom graph). • Understand that positive values on the speed axis are flood current and negative values are ebb current. • Match flood vs. ebb direction: for Buoy 10, Mean Flood Dir = 280°T and Mean Ebb Dir = 104°T, as printed on the chart.

💭 Think About

• At 2030 on 10 November, is the current on the Buoy 10 graph above or below the zero line? That tells you if it’s flood or ebb. • Once you know if it’s flood or ebb, which of the answer choices has a direction that matches the proper mean direction for that phase at Buoy 10 (280°T for flood, 104°T for ebb)? • About how strong (in knots) is the current at 2030 on 10 November on the Buoy 10 graph, and which answer choice has a similar magnitude (0.4 kts vs 2.1 kts)?

✅ Before You Answer

• Make sure you are reading time and date correctly on the bottom axis: 2023-11-10 at 2030 (between 20:00 and 21:00). • Confirm you are using the Buoy 10 (ACT6611) graph, not the Lower Town Creek Reach (ACT6706) graph. • Check that the chosen answer’s direction matches the correct phase (flood vs. ebb) and its speed matches the plotted value (≈0.4 kts vs ≈2.1 kts).

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