Autonomous Surface Vehicles (ASV) won the second phase of the recent SBRI competition to develop a long endurance marine unmanned surface vehicle (LEMUSV). ASV will undertake the detailed production design, build, commissioning and sea trials of a fully operational, open ocean going C-Enduro 4 vessel. The vehicle design will utilize technologies from the consortium and be designed specifically to be capable of being deployed at sea for up to three months in all weather conditions and sea states.