Yes. It can be advantageous for people who have a mooring in Croatia, for example. In this example, depending on the time spent outside the EU waters, the VAT can be reduced to 0% for each lease payment.
At the end of each year, you have the option to be charged according to the “forfait regime” (9.8% VAT on the lease instalments) or according to the actual time spent outside EU waters. In the latter case, proof that the vessel has been berthed outside the EU for the whole year and a written confirmation of your stay outside the EU during this period is required, e.g. your log book is sufficient.