Calculates the third variable given the other two (distance covered, given speed and elapsed time)
NATO pattern. A simple device for calculating the third variable given that you know the other two.
7" x 1-1/4" clear plastic.
Gives immediate solution to all speed-time-distance problems.
Permits rapid solution of problems involving vectors, such as those encountered in current sailing, determination of true wind direction and force, and apparent wind to be expected on other headings.
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