USCG Exam PracticeApplying tide corrections to charted depth
A vessel with a draft of 9 feet must transit a channel with a charted sounding of 7 feet. The minimum predicted height of tide required to provide at least 1 foot of underkeel clearance is:
- A. 1 foot
- B. 2 feet
- ✓ 3 feetCorrect
- D. 4 feet
Why C is correct
Required actual depth = draft + underkeel clearance = 9 + 1 = 10 feet. Required height of tide = required actual depth - charted sounding = 10 - 7 = 3 feet. This follows directly from Bowditch Ch. 9 §904.
Cited:Bowditch Ch. 9 §904