The Stalwart-class ocean surveillance ships had maximum speeds of . They were built to be fitted with the Surveillance Towed Array Sensor System (SURTASS) system. The ship had an endurance of thirty days.
The Stalwart-class ocean surveillance vessels had maximum speeds of . They were built to operate in conjunction with the Surveillance Towed Array Sensor System (SURTASS) system, which is also used by other naval vessels. The ship's endurance was thirty days.