Question 1950Navigation General

The correct answer is A) Tidal Current Tables. Tidal Current Tables provide information on the duration of slack water, which is the period of time when the tidal current is at its weakest, typically occurring near the time of high or low tide. This information is crucial for mariners, including Coast Guard license candidates, to plan their navigation and operations effectively. The other answer choices are not the appropriate sources for information on the duration of slack water. Tide Tables focus on the timing and height of tides, but do not provide specific details on current patterns. Sailing Directions and the American Practical Navigator are general reference guides that may contain some information on tidal currents, but Tidal Current Tables are the primary and most authoritative source for this specific data.