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?
• Chart symbols for pipelines vs cables on U.S. river charts • How different line styles (solid, dashed, close-spaced, with/without labels) indicate different underwater utilities • The role of chart legends in decoding special symbols
• On a chart, what visual differences usually separate pipelines from cables (look at spacing, pattern, and any nearby labels)? • If you looked in the chart’s marginal legend for underwater utilities, which symbol there would most closely match three close straight dashed lines through a point? • Think about which of these choices (gas, power, oil, fiber optic) are most commonly associated with special protection from anchoring or dredging and how that’s usually shown on charts.
• Check the chart legend or symbol key for the exact pattern of three close straight dashed lines and what feature it labels. • Confirm whether pipelines are normally labeled with text (e.g., PIPELINE, GAS, OIL) or a specific line style different from cables. • Verify how submarine cables are typically depicted compared with pipelines on the chart in your training materials.
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