USCG Exam PracticeApplying tide corrections to charted depth
A vessel's tide tables show a tide height of +3 feet above datum at the time of transit. The charted depth at a shoal is 8 feet. What is the actual depth of water over the shoal at that time?
- A. 5 feet
- B. 8 feet
- ✓ 11 feetCorrect
- D. 3 feet
Why C is correct
Charted soundings are referenced to MLLW (Bowditch Ch. 4 §403). When the tide is above datum, that height is added to the charted depth to obtain actual depth. 8 ft charted + 3 ft tide height = 11 ft actual depth.