How Bait Boats Can Confuse Fish
By spreading bait over a fairly large area using a bait boat, your actual line with its bait is camoflagued amongst all that bait. Large bait drops encourage strong feeding, especially from fish like Carp that like to get into a feeding frenzy. Once you have the fish in that state of mind, a hook in the middle of the bait is just waiting to be snagged by a hungry mouth.
Always look at the baiting habits of the local fishermen. If they are using bait boats often, or large boilies, you will get to know the feeding habits of the fish.