Haiying-Cal Tec Marine Technology Co., Ltd. (Haiying Marine), located in Wuxi, China, is a world-leading supplier of underwater acoustic products. Since its establishment in 1994, Haiying Marine has been dedicated to research and development, manufacturing, and agency services for oceanographic electronic instruments, including echo sounders, hydrophones, sound velocity profilers, acoustic Doppler current profilers (ADCPs), tide gauges, altimeters and sub-bottom profilers.