GulfMark Offshore makes its mark on the high seas. The company offers support services for the construction, positioning, and operation of offshore oil and natural gas rigs and platforms. Marine services include anchor handling; cargo, supply, and crew transportation; towing; and emergency services. Some of its ships conduct seismic data gathering and provide diving support. It owns, manages, or almost 73 vessels in the North Sea, offshore Southeast Asia, offshore West Africa, offshore the Middle East, offshore Brazil and the US Gulf of Mexico, offshore India, offshore Australia, offshore Trinidad, the Persian Gulf, the Mediterranean Sea, offshore Russia and offshore East Africa.