The RPG is and excellent weapon, but probably worthless in trying to hit a fast moving small boat. MUCH better choice would be heavy machine gun (like the russian 14.5) or a 20mm autocannon like ths older hispano
I like the portability of the RPG.It can be put away and gotten out quickly.
These ships are supposedly unarmed, I believe the International community would crap themselves if deck weapons were mounted on these ships. Although I have no objections.
An RPG going off in close proximaty to a skiff full of African Tyrones should be pretty devastating to their bad intentions.