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USCG Exam PracticePlotting with variation and deviation (T-V-M-D-C)

Soundings on a US nautical chart are referenced to which datum?

  1. A. Mean Sea Level (MSL)
  2. B. Mean Low Water (MLW)
  3. ✓ Mean Lower Low Water (MLLW)Correct
  4. D. Lowest Astronomical Tide (LAT)

Why C is correct

US charts reference soundings to Mean Lower Low Water (MLLW), as stated in the chart title. The unit (feet, fathoms, or metres) must also be verified in the chart title before plotting.

Cited:Bowditch Ch. 4 §403

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Soundings on a US nautical chart are referenced to which datum? — USCG Exam Practice · CaptainsGround