USCG Exam PracticeApplying tide corrections to charted depth
When using NOAA Tide Tables to obtain predictions for a subordinate station, which procedure is correct?
- A. Use the subordinate station's predictions directly without adjustment, as they are independently calculated.
- ✓ Apply the tabulated time and height differences for the subordinate station to the reference station predictions.Correct
- C. Average the predictions from the two nearest reference stations.
- D. Apply the tidal current differences from the Tidal Current Tables to the reference station tide predictions.
Why B is correct
Predictions for a subordinate station are obtained by applying the tabulated time and height differences to the predictions of its reference station. The Tidal Current Tables are a separate publication used for current, not tide height. (Bowditch Ch. 9 §905)
Cited:Bowditch Ch. 9 §905