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The Coast Guard is trying out a new tool to protect New York's harbor during the Republican Convention: a new-fangled sonar that can peer through the City's underwater muck.
Traditional sonar just shows a blip on a screen, the New York Times notes; it tells you that something is down there, but it doesn't say what that something is. This new brand of sonar, called the "Mobile Inspection Package," gives much more precise pictures. With a series of colored lines, you can see the outlines of a ship's hull, or a pier, or a diving evil-doer in three dimensions.
-- a good tool for preventing USS Cole-type attacks in the future... it will make New York any safer during the G.O.P.