Which measurement uses mean high water as...

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Question 1 of 2066636ee928f7522a1c519bb3

Which measurement uses mean high water as the reference plane?

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Question 1 of 20

66636ee928f7522a1c519bb3

Which measurement uses mean high water as the reference plane?

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🔍 Key Concepts

• Chart datums used for depths vs. heights on U.S. nautical charts • Difference between mean lower low water (MLLW) and mean high water (MHW) • What vertical features (like lights, bridges, cliffs) need a height measured from a typical high-water level

💭 Think About

• Ask yourself: when navigating, which information needs to be safely above the highest expected water level, and which needs to ensure clearance at the lowest? • Consider which chart measurements must remain conservative for under-keel clearance versus for overhead clearance or visibility of aids to navigation. • Think about whether all vertical measurements share the same reference, or if depths and heights use different tidal datums.

✅ Before You Answer

• Identify which datum U.S. charts normally use for soundings/depths (hint: it is a low-water datum). • Identify which datum is typically used for heights of lights and other elevated features relevant to visibility and clearances. • Confirm whether the word "all" in one of the options can really be correct, given the different safety needs for depths versus heights.

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Question 1 of 2066636ee928f7522a1c519bb3

Which measurement uses mean high water as the reference plane?

Back

Question 1 of 20

66636ee928f7522a1c519bb3

Which measurement uses mean high water as the reference plane?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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