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USCG Exam PracticePlot true course and distance between two charted points

US nautical chart soundings are referenced to which vertical 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

Bowditch Ch. 4 §403 states 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 and must be verified before plotting.

Cited:Bowditch Ch. 4 §403

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US nautical chart soundings are referenced to which vertical datum? — USCG Exam Practice · CaptainsGround