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EXPANDING SQUARE SEARCH:Expanding Square Search IAMSAR Search PatternsMost effective when the location of the search object is known within relatively close limits.The commence search point is always the Datum Position.To be used by a single ship during a search.Often appropriate for vessels or small boats to use when searching for persons in the water or other search objects with little or no leeway.Accurate navigation is required.The first leg is usually oriented directly into the wind to minimize navigational errors.All course alterations are of 90O.Two first two legs will be of same length...