And that t is a situation that is tighter and it will be even more in the future.
A boat without VAT will de very difficult to sell in Europe because the chances are that the future owner, sooner or later, will have to pay the VAT. Of course you can always sell it cheaper taking into account the VAT.
That is not the only problem; you have to see if your boat is EC certified, otherwise it will have to be certified.
One possibilities is to stop at Azores, declare a very unrealistic small value to the boat and pay VAT there (they don't know much about boat prices). The VAT in Azores is different from the rest of Portugal and one of the lowest in Europe.