At Filter Point Light mile 475 (AHP) there...

Question 1 of 29218fork_82cd5af5782c47be96b

At Filter Point Light mile 475 (AHP) there are 3 close straight dashed lines on the map passing through the black dot below the number 475. What do these lines represent?

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Question 1 of 29218

At Filter Point Light mile 475 (AHP) there are 3 close straight dashed lines on the map passing through the black dot below the number 475. What do these lines represent?

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🔍 Key Concepts

• Chart No. 1 – U.S. Chart Symbols for lines and utilities • Differences between overhead vs. underwater (submarine) features on charts • How dashed vs. solid vs. symbol-marked lines are used on river charts

💭 Think About

• Look at how each of the four choices would normally be shown on a chart: would it be above the water or below, and how is that usually drawn? • Think about why three very close straight dashed lines would be drawn together through a single point—what kind of feature needs multiple parallel lines? • Consider which of these features would logically be located near a light and a specific river mile reference point.

✅ Before You Answer

• Check Chart No. 1 legend for the exact symbol of a submarine pipeline versus a submarine cable—their dashed patterns are different. • Verify how overhead power lines are shown; do they usually use simple dashed lines alone, or additional symbols/markings? • Confirm how a weir or training structure centerline is drawn on inland river charts—does it appear as multiple close parallel dashed lines through a reference dot?