In the 1990s, the OVA Imaria underwent a modernization program, which included the installation of new electronic systems, including a new combat management system and a communications system. The ship also received new armament, including a surface-to-air missile system.
The OVA Imaria was 113 meters (371 feet) long, with a beam of 11.5 meters (37.7 feet) and a draft of 3.5 meters (11.5 feet). The ship displaced approximately 2,500 tons at full load. It was powered by two diesel engines, which provided a top speed of 25 knots (46 km/h). The ship's propulsion system also included two controllable pitch propellers and a bow thruster. OVA Imaria
The OVA Imaria entered service with the Portuguese Navy in 1974 and quickly became a valuable asset in the fleet. The ship's primary role was ASW, and it was equipped with the latest ASW technology, including sonar and torpedoes. In the 1990s, the OVA Imaria underwent a