This formula is basically the Pythagorean Theorem which you can see if you imagine the given line segment as the hypotenuse of a right triangle. L measured length of base. It is given by the formula.
Divide 3 shots of chain 270 feet by 7 for a rougher anchorage or for an overnight anchorage where the sea might build and you have enough anchor chain to anchor securely in about 38 feet of water.
Cs 1 24 WP2 L. Correction for slope of vertical alignment. Easily confused with arc length. The vertical slope angle of the length measured must be measured.