Question 65

The Correct Answer is D **Why option D ("Tidal Current Tables") is correct:** The question asks for a publication containing daily information about the duration of **slack water**. Slack water refers to the brief period when a tidal current stops moving (zero velocity) before reversing direction. Tidal Current Tables are specifically designed to provide daily predictions for currents, including the times of maximum velocity and the times (and sometimes duration) of slack water for various locations. **Why the other options are incorrect:** * **A) Tide Tables:** Tide Tables primarily provide daily predictions for the **height and time of high and low tides** (vertical movement of the water). While related to currents, they do not provide the detailed daily timing or duration of slack water (horizontal movement). * **B) Sailing Directions:** Sailing Directions (or Pilots) provide descriptive, detailed textual information about navigational hazards, aids, customs, weather patterns, and general guidance for a specific geographic area. They contain general notes about tidal currents and their strength but do not contain daily, tabular predictions for slack water times. * **C) American Practical Navigator (Bowditch):** This comprehensive handbook is an authoritative reference on marine navigation, covering astronomy, piloting, electronics, and oceanography. It explains the principles of tides and currents but does not contain the necessary daily predictive tables (like those found in the Tidal Current Tables) required to answer the question.