That was before cheap GPS units. Now every small boat can successfuly navigate over the horizon, and arrive to within a few yards of where they're supposed to be. Even at night while its raining
Even if the boats get them there, they will be able to take very little food or ammuntion. Once the fishing boats start congesting an area, coastal artillery, naval craft, and air power will break it up. It will be a large scale version of the Bay of Pigs.