What is the sounding datum used on US nautical charts?

A. Mean High Water (MHW)
B. Mean Sea Level (MSL)
C. Mean Low Water (MLW)
✓ Mean Lower Low Water (MLLW)Correct

Why D is correct

Bowditch Ch. 4 §403 specifies that US charts show soundings referenced to Mean Lower Low Water (MLLW). The unit of measurement (feet, fathoms, or metres) is stated in the chart title.

Cited:Bowditch Ch. 4 §403

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What is the sounding datum used on US nautical charts? — USCG Exam Practice · CaptainsGround