The 50/90 rule of tides is a helpful tool for boaters to estimate the speed of tidal currents. This rule breaks down the period between slack water and peak current into three intervals, with the current reaching 50% of its maximum speed in the first interval, 90% in the second, and full speed in the third. The pattern reverses as the current slows down, providing a general progression of current speeds over the course of the cycle. While not a precise prediction, the 50/90 rule is a useful approximation for understanding changing current speed. Boaters can learn more about the 50/90 rule and other important boating rules of thumb by checking the links in the video description.
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