Which is the reference datum used in...

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Question 1 of 2066636ee928f7522a1c519fa7

Which is the reference datum used in determining the heights of land features on most charts?

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66636ee928f7522a1c519fa7

Which is the reference datum used in determining the heights of land features on most charts?

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🔍 Key Concepts

• Difference between vertical datums used for soundings (water depths) and those used for elevations of land features • What mean sea level represents compared to other tidal datums • How chart makers ensure that land elevations and bridge clearances relate sensibly to the mariner’s eye and the chart’s water level

💭 Think About

• Ask yourself: are land features (like hills, lighthouses, cliffs) described in relation to the lowest water, the highest water, or an average water level? • Think about which datum makes the most sense for a mariner trying to identify a hill or lighthouse visually from sea—would you want that elevation tied to the extreme low tide, extreme high tide, or the long‑term average? • Consider which datum is most commonly used as a general vertical reference in geography, mapping, and engineering, not just in nautical charts.

✅ Before You Answer

• Be clear that soundings (depths) on most charts use a low‑water datum, while this question is asking about heights of land features. • Check which option is widely used as the standard vertical reference for topographic elevations worldwide. • Eliminate any datum that is clearly associated with tide extremes rather than a long‑term average reference.

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Question 1 of 2066636ee928f7522a1c519fa7

Which is the reference datum used in determining the heights of land features on most charts?

Back

Question 1 of 20

66636ee928f7522a1c519fa7

Which is the reference datum used in determining the heights of land features on most charts?

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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