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I didn't intend the SeaRAM and ESSM as anti priacy weapons, mainly they were to give the vessels some sort of SAM capability which they'd been previously lacking. For dealing with pirates, the Bofors 120mm is considered just fine, as are the embarked helos. Most pirates are armed with nothing more than light MGs or RPGs. The challenge is more at detecting them in cluttered littorial waters than killing them--which is exactly the method of disposal.
I'm debating the general merit for OPVs, as Pallamara seems to be located about 1000 miles from anything, replacing Diego Garcia on the map, which is why i've mainly gone for longer ranged frigates and destroyers.
as I said, for detecting, the I mast series might be perfect (those are designed with this sort of tasks in mind) but they are rather expensive.
opv's aren't that short ranged btw