"And what marina or broker is going to let a cert. mech from another company work on their boat."
The kind that wants to sell a boat! If pulling a plug to shove a camera down the hole is considered working on the boat, they are hiding something. A boat is a Big, Expensive purchase. Its worse than house but about the same price (Sometimes More) Houses dont have engines or sit in Salt Water, so you better check everything on your new investment real good before you sighn on that dotted line. A seller should allow a surveyor to go throug the entire boat, and a Mechanical surveyor to open and look wherever he needs to look to be sure the boat and engines are in good shape. And the Broker does not have a say so in who touches the boat. The owner does. The broker is only a middleman to make sure the transaction runs smooth and to assist in any problems throughout the sale. After the sale is final there is no longer a buyer and a seller. There is a new owner and someone that owned that boat in the past. That is why we write so many stinkin contracts and if there are questions we address them ahead of the closing.