USCG Exam PracticeApplying tide corrections to charted depth
When applying tide table predictions from a reference station to a subordinate station, which of the following is an essential check before computing the corrected time of high water?
- A. Verify the phase of the moon to determine spring or neap conditions.
- B. Confirm the tidal current direction at the subordinate station.
- ✓ Verify the correct time zone and whether daylight saving time is in effect.Correct
- D. Confirm the sounding unit stated in the chart title.
Why C is correct
Bowditch Ch. 9 §905 specifically cautions to always check the correct time zone and daylight time before applying a prediction. Failure to account for daylight saving time is a common source of error in tide calculations.
Cited:Bowditch Ch. 9 §905