USCG Exam PracticeApplying tide corrections to charted depth
A chart shows a sounding of 8 feet in a channel. The NOAA Tide Tables predict a tide height of +3.5 feet at the time of transit. What is the actual depth of water in the channel at that time?
- A. 4.5 feet
- B. 8.0 feet
- ✓ 11.5 feetCorrect
- D. 3.5 feet
Why C is correct
Actual depth equals the charted sounding plus the predicted height of tide. 8 feet + 3.5 feet = 11.5 feet. The charted sounding alone (8 feet) represents depth at MLLW, not at the time of transit. (Bowditch Ch. 9 §904)
Cited:Bowditch Ch. 9 §904