What is the surge rate commonly measured in?

The surge rate is typically measured in yards per knot, which is a unit that reflects how the surge affects the movement of vessels in tidal currents or waves. This measurement is particularly relevant in maritime settings, where understanding how quickly water movement can impact a vessel's navigation is crucial. Using yards per knot allows mariners to relate the surge effect directly to the speed at which they are traveling, facilitating better decision-making regarding course adjustments, anchoring, and other navigational maneuvers.

While measurements in feet per second, kilometers per hour, or miles per hour are commonly used for speed in broader contexts, they do not specifically account for the nautical environment and the unique dynamics of water surge. Yards per knot gives a clear, practical understanding of water movement relative to nautical speed, making it the most appropriate unit for this context.