If that is all the decree has to say with regard to the disposition of the marital property - each retains what they now have in their possession - then you have no quarrel with your ex-wife. Not unless she somehow interferes with your possession of your precious toy!
Just because you voluntarily conveyed over your vested title to the marital home, does not, per se, set any precedent or justifying your demands that she respond similarly with respect to the boat.
Your beef is with the shortsighted, amateurish chowderhead that is responsible for preparing and submitting such an appalling piece of ineffectual legalese.
You might possibly find relief by means of a nunc pro tunc order. But you would need to consult with a knowledgeable attorney capable of determining whether there is anything in the court record or testimony supporting such a post judgment order.
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I'm sure you are already aware, but whatever: "A boat is a moving hole in the water in which you pour money." And the two happiest people in the world are the guy who just bought one and the guy that sold it.

