What soundings are indicated by a blue tint...

What soundings are indicated by a blue tint...

Question 1 of 27070

Q

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

A

30 fathoms or less

B

30 feet or more

C

30 fathoms or more

D

30 feet or less

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Question 1 / 2707066636eea28f7522a1c51b586

Question 1 of 2707066636eea28f7522a1c51b586

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

Question 1 of 27070

Study area:

Study area:

Q

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