The Impeccable is a sole ship in it's class. It is the newest US Navy's ocean surveillance ship, which was designed to gather acoustic data, to detect and track submarines. Originally five ships of this class were planned, however remaining four ships were never built.
Hull of this ship is catamaran-type, based on Victorious class. It is larger and faster than it's predecessors. Twin-hull design has a greater stability at low speeds under adverse weather conditions. It prevents vessel from rolling in heavy seas and gives additional deck space. The Impeccable is on of the quietest surface vessels in the US Navy, outside the submarines.
Vessel is built to tow two underwater listening devices. It has both active and passive capabilities. It collects, processes and transmits anti-submarine warfare data via satellite to shore stations. In addition to acoustic equipment, the Impeccable carries extensive suite of navigation, communications, command and control equipment.
Crew onboard the ship consists of 25 civilian mariners and 20 navy personnel. Vessel carries no armament.
The Impeccable class ship is powered by a diesel-electric propulsion system, that generates 5 000 shp. It is also fitted with omni-thruster hydrojets, developing 1 800 hp. The Impeccable has a maximum speed of 13 knots, which reduces to 3 knots, when ship tows a sonar. Patrols are usually 60 - 90 days in duration.