Berth No. SD10. Ocean Masters 420 and 460 designs offer fitting options that create either a fabulous family cruising RIB, a luxury tender or a hard working support vessel. Whatever layout you choose, you can be assured that your Ocean Master is built to last. The Ocean Master range is designed with tough conditions in mind. Internal under-deck fuel tanks, non-slip deck, self-draining deck and a 20º dead rise let you take on even the toughest conditions confidently.