I read too that they used a kind of dragnet technique, where the boats spread out abreast with maybe 50 miles between them and they "swept" the sea. Much like how fowl hunters walk abreast through the bushes to flush game birds. Only problem was I think maximum visibility is maybe 15 miles so there were always holes in their line of sight. It was in all reality a pathetically hit and miss operation with too few boats and ineffective tactics.
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