Now do that with both vessles moving at full throttle and the target trying to evade. In choppy seas.
stay safe.
As long as the swells aren't so high they actually break LOS between the ships/boats, that's a pretty trivial problem.
The target vessel can keep turning so much the laser can't physically dwell on one spot long enough to burn through, but then it'll also be turning so much it's negating it's escape too.