square search[′skwer ′sərch]
Search by a series of course lines such as to produce an expanding square pattern relative to either a fixed point or a moving point. Also known as expanding square search.
A search pattern in which the initial pattern is a square, with the length of each side of the square approximately 1.8 times the prevalent visibility. After three legs of the square have been flown, the fourth leg is extended by one visibility length.