USCG Exam PracticeTides and currents — predictions and corrections
On a U.S. nautical chart, the datum to which charted soundings are referenced is:
- A. Mean High Water (MHW)
- B. Mean Low Water (MLW)
- C. Mean Sea Level (MSL)
- ✓ Mean Lower Low Water (MLLW)Correct
Why D is correct
Charted soundings on U.S. charts are referenced to Mean Lower Low Water (MLLW), which is also the datum from which tide tables predict the height of tide. Bridge and light heights are referenced to Mean High Water.
Cited:Bowditch Ch. 9 §904