Just for the sake of clarity, the sailboat’s engine can be on to charge the batteries or chill the cold plate, and she will still have rights if the engine is not being used for propulsion. Think transmission in neutral. You may not understand how or why a sailboat does what it does, but your ignorance doesn’t change your burden to give way.
Also, more fishermen should learn the difference between “trolling” and “trawling”. And if you think planar boards constitute the latter(they don’t) you owe us all some day shapes that advertise your ignorance. Know the rules.
In this case, there is simply no way to imagine a realistic scenario where the sailboat is at fault or could have avoided the collision. Charter boat captain is gonna have to go back to his land job.