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- Q342 - Navigation General: Great Lakes and Inland
64. Which datum is used for soundings on charts of the East Coast of the United States?
Soundings on East Coast U.S. nautical charts are referenced to Mean Lower Low Water (MLLW), the average of the lowest daily low tide over a 19-year period. This datum provides a conservative estimate of charted depths, ensuring actual water depths are typically equal to or greater than the charted sounding.
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