Anyways, I never thought that sea-planes are still used today. I guess the ShinMaywa US-2 could be an important asset for the PH Navy and PH Coast Guard since helicopters has limited range, speed and requires a solid platform to land and to take-off.
In fact we are finalizing the sale of 20 for the Indian Navy. They are very effective for maritime air patrols as well as maritime rescues , interdiction duties. Given the Philippines' archipelagic nature , it may prove effective when conducting maritime patrols between Philippine - Indonesian , as well as Philippine- Malaysian sea border. Not to mention in areas of interest in the South China Sea.
And reading the history of PH Navy, when it was founded in 1898 established back in 1935, it was originally for "Offshore Patrol" (later renamed "Philippine Naval Patrol") which is based on the idea that a fleet of small vessels (during those times, the P.T. Boats) would have significant effect in dealing with hostile ships. I guess ships like the Hayabusa-class missile patrol boat would be cost-effective; being cheaper than a frigate despite having anti-ship missiles as we do not need ships larger than frigates and we need more subs than surface ships.
Absolutely there are pros to maintaining a fleet of small, nimble ships which have credible firepower. Take for example the Indonesian Navy -- they do not maintain vast numbers of destroyers, but , rather, maintain large numbers of corvettes , frigates, and OPVs. This is beneficial especially for nations with a vast maritime border and islands.
In regards to the Hayabusa Class, these can be armed with Type 90 SSMs. A pack of these can easily sink and negate lumbering frigates, destroyers.
Type 90 SSM1,
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