At the moment in game, the boats do not act like real boats, they Respond like a container ship, rather than the powerful out board they are, there turning circle should be tiny and they should be manoeuvrable at very low speeds but there not. whats stranger is that Apcs like the marshal ingame act more like a real boat than the RHIB.
Can I suggest that the physics are made similar to the apc where the power is directional, and parallel to the prop not the back of the boat.