USCG Exam Practice · Applying tide corrections to charted depth
US nautical charts reference charted soundings to which vertical datum?
- AMean High Water (MHW)
- BMean Sea Level (MSL)
- CMean Lower Low Water (MLLW)✓ correct
- DMean Low Water (MLW)
Why C is correct
Bowditch Ch. 4 §403 states that US charts show soundings referenced to Mean Lower Low Water (MLLW). This datum represents a conservative (lower) reference, meaning actual water depth at any given moment is typically equal to or greater than the charted sounding.
Cited:Bowditch Ch. 4 §403
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