Volvo Penta has introduced several industry-first innovations to the marine engine market, including the sterndrive unit, contra-rotating propellers Duoprop, and Forward Drive. In 2005, Volvo Penta launched the first IPS engine, a new "pod type" boat drive system with counter rotating forward-facing propellers operated by a joystick. Its engines are used by more than 140 boat manufacturers including Fairline Boats, Sunseeker, Riviera, Four Winns, and Cranchi. In conjunction with Volvo owned CPAC Systems, Volvo Penta and Yamaha Motor signed an agreement involving technological partnership in December 2010.