It's much easier to add anti-submarine weapons later than add a hull-mounted sonar. Could be an ASW helicopter.ELAC SONAR GmbH, a German supplier of hydroacoustic systems, announced that it completed sea acceptance tests of the HUNTER hull-mounted sonar for the Philippine Navy's Gregorio del Pilar-class frigates on 27 July 2023.
HUNTER 2.0 is a hull-mounted sonar carrying out anti-submarine warfare (ASW) in active and passive modes in shallow and deep waters for panoramic detection of submarines and other objects. The system features a forward-looking mine avoidance mode as well.
Not much other information is given in this article, like on which of the three frigates (or maybe the whole class) the new sonar system
ELAC SONAR GmbH completed SAT of the HUNTER hull-mounted sonar for the Philippine Navy's Del Pilar-class frigates on July 27, 2023.www.navalnews.com
It is also unclear why a sonar will be installed, while the vessels do not have/get anti-submarine weapon systems.
Here we can find some more details about the upgrade program of the Gregorio del Pillar class.
Overview: The Philippine Navy has long been planning to improve the capabilities of the three Del Pilar -class frigates it acquired from th...maxdefense.blogspot.com