Upgrades
Aside from the new M242 Bushmaster 25 mm cannon and upgrade of its Command and Control & Fire Control Systems as part of the ship's Phase 1 upgrade, the Philippine Navy also installed a new Raytheon Gyro Compass, Sperry Marine Naval BridgeMaster E Series Surface Search Radar, GPS, Anemometer, and EM logs. These were integrated with the ship's existing systems. The Phase 1 upgrade was completed last 2005.
The Phase 2 is the Marine Engineering Upgrade Program, which includes the repair and remediation of the hull, overhaul and improvement of the Main Propulsion including control and monitoring systems, electrical plant, auxiliary systems, outfitting and hull furnishings and training the navy crew in the operation and maintenance of the new plant.
Phase 3, which is still under bidding, is a Service Life Extension Program (SLEP).
Apart from the upgrades, additional refits were made to replace the four (4) 7.62mm machine guns with two (2) .50 caliber heavy machine guns and two 20 mm Mk.16 cannons. There are plans to add anti-ship missiles to the ships, but due to top-weight problems, it would have to be a lightweight system such as Sea Skua, although no missiles have been ordered to date.
Read more about this topic: BRP Artemio Ricarte (PS-37)