noun
: a ship's log for use in shallow water and strong currents in which the chip is replaced by a sinker that rests on the bottom and measures speed over the ground rather than through the water
noun
: a ship's log for use in shallow water and strong currents in which the chip is replaced by a sinker that rests on the bottom and measures speed over the ground rather than through the water
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012