What is the 50-90 rule in kayaking?
Rule gives you “… the SPEED OF THE CURRENT at the end of each hour. Counting from slack, the current will flow at 50% of its maximum speed at the end of the first hour, 90% at the end of the second hour and full 100% or maximum speed at the end of the third hour and then back to zero with the same steps. The 50-90 Rule measures speed of the current at the end of each hour of a tide cycle from slack to max flow back to slack (0/50%/90%/100%/90%/50%/0). The Rule of Thirds measures drift or the distance the current travels each hour of the tide cycle (1:2:3:3:2:1).