USCG USCG GENNAV
Set 2 • Question #56 of 246
Launch Interactive Practice Room The datum used for soundings on charts of the East Coast of the United States is __________.
A
mean low water springs
B
mean low water
C
mean lower low water
✓ Correct Answer
D
half tide level
USCG NMC Regulatory Explanation
Mean Lower Low Water (MLLW) is the average of the lower low water height of each tidal day over a 19-year National Tidal Datum Epoch. It serves as the official chart sounding datum on NOAA nautical charts.
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