Geo Marine Instrument Co. Ltd is part of Geo Marine Sea Technology Co., Ltd. founded in 1999 in Hong Kong with branch offices in Shanghai. It is active in marine science and technology, equipment technology providing for ocean mapping, marine geophysical exploration, physical oceanography, underwater engineering, through water and underwater positioning guidance. Its products are used in ocean mapping, marine geophysical exploration, physical oceanography, underwater engineering, communications and navigation and for positioning on the surface and underwater.