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Published online by Cambridge University Press: 23 November 2009
In recent years acoustic logs have begun to replace mechanical and electromagnetic logs as a technique for measuring the speed of ships at sea. The acoustic Doppler log has become well established and, although its performance is usually far from ideal, there are many models available commercially, including those from Krupp Atlas, Thomson CSF, Simrad, Magnavox, Edo Western, Marquardt, Sperry and Amatek Straza. The acoustic correlation log has only made its appearance relatively recently.