USCG Exam PracticeTides and currents — predictions and corrections
On a US chart, charted soundings are referenced to which datum?
- A. Mean Sea Level (MSL)
- B. Mean High Water (MHW)
- ✓ Mean Lower Low Water (MLLW)Correct
- D. Mean Low Water (MLW)
Why C is correct
Bowditch Ch. 9 §904 specifies that charted soundings on US charts are referenced to Mean Lower Low Water (MLLW). Heights of bridges and lights are referenced to Mean High Water, not soundings.
Cited:Bowditch Ch. 9 §904