Electromagnetic Geoservices ASA is a Norwegian geophysical services company using proprietary marine electromagnetic technology to support oil and gas companies in their search for offshore hydrocarbons. The administrative and research headquarters are located in Trondheim. The company was established on February 1, 2002 by the founders Terje Eidesmo, Ståle Johansen and Svein Ellingsrud. EMGS pioneered marine electromagnetic technology with the first successful application and commercialization of controlled source electro-magnetic surveying technology. Marine EM, or CSEM, is an emerging exploration method that uses electromagnetic energy to detect resistive bodies - including hydrocarbon reservoirs - beneath the seabed. The technique used by EMGS was trialled in 1998 using a towed, high-power EM source and a series of seabed receivers, while the founders were working for Statoil. The company acquires 3D electromagnetic and marine magnetotelluric data, which are used to assess formation resistivity before drilling, and interpret and integrate this information with other geodata to aid exploration decision making. Wikipedia