What soundings are indicated by a blue tint...

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What soundings are indicated by a blue tint on this chart?

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Question 1 of 29218

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What soundings are indicated by a blue tint on this chart?

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🔍 Key Concepts

• Standard color conventions on U.S. nautical charts for shallow vs. deep water • Relationship between blue shading and the depth limit it represents • Difference between feet and fathoms as depth units on charts

💭 Think About

• On most navigation charts, does blue shading usually warn you of water that is safe for deep draft or more dangerous for grounding? • Think about common depth contours: what is a typical limiting depth used for small craft vs. larger vessels? • How many feet are in one fathom, and how would that change the numbers you see on the chart?

✅ Before You Answer

• Confirm whether blue on the chart legend is associated with shoaler (shallower) or deeper water areas • Convert between feet and fathoms (1 fathom = 6 feet) to compare the options correctly • Check which option matches a maximum depth boundary commonly used for blue shading on standard charts