Built in 1986, by the Western Towboat Company Incorporated of Seattle, Washington (hull #4) as the Ocean Navigator for the Western Towboat Company of Seattle, Washington.
She was the the fifth Mariner class tug built by the Western Towboat Company. The tug was a slightly modified design from that of her predecessors. The tug's hull is constructed of steel, with the pilot house, and superstructure constructed of aluminum.
Powered by two, Caterpillar 3516 diesel engines. With Niagata MGN1747 reduction gears, at ratio of 7:1. Turning two, 100(n) by 86(in) stainless steel, fixed pitch propellers, mounted in Nautican kort nozzles, she is a twin screw tug, rated at 3,100 horsepower.
Her electrical service is provided by two, 55kW Caterpillar 3304 generator sets. The tug's capacities are 60,000 gallons of fuel, and 750 gallons of lube oil.
The tug's towing gear consists of a single drum, Nordic towing winch. Outfitted with 2,800(ft) of 2(in) towing wire.
(Captain Ric Shrewsbury, Captain Russell Shrewsbury)