Which datum is used for soundings on charts...

Question 1 of 2707066636ee928f7522a1c519505

Which datum is used for soundings on charts of the East Coast of the United States?

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Question 1 of 27070

Q

Which datum is used for soundings on charts of the East Coast of the United States?

🔍 Key Concepts

• Chart sounding datum on U.S. coastal charts • The difference between mean low water, mean lower low water, and mean low water springs • How NOAA and U.S. charts standardize vertical datums along the U.S. coastline

💭 Think About

• Ask yourself: Which tidal level gives mariners the most conservative (safest) water depth for navigation on East Coast charts? • Consider which of these datums is commonly used by NOAA for U.S. coastal charts, especially in areas with a mixed or semidiurnal tide. • Think about which option is used consistently along most of the U.S. Pacific and Atlantic coasts as the chart sounding datum.

✅ Before You Answer

• Look up how NOAA defines the chart datum for soundings along the U.S. East Coast in its tidal datums publications. • Verify which of these tidal levels is defined as the average of the lower low waters over a 19-year period. • Confirm that the correct datum is the one that is standard for U.S. coastal charts, not a special case like springs or half tide.