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  • (cur | prev) 16:52, 25 February 2012 Davidboslaugh (Talk | contribs) (404 bytes) (Drawing of an NC-2 Plotter, also called a dead reckoning tracer (DRT). The plotting surface of the desk sized DRT was about waist high, and before the advent of digital automation it was one of the most important anti-sub tools aboard a Navy surface ship.)