Check the VAT situation prior to putting your boat into charter
. You currently have an EU VAT paid boat which you could put under charter
in the Med. I believe if you put your boat under charter in Thailand
you'll be liable for Thai VAT (which I believe is quite steep).
PS - I suspect your boat has depreciated so much because your purchase price
of € 280K includes VAT. I'll bet the buyer's offer is calculated on the depreciated price
of similar boats that are VAT Exempted. It's possible to buy VAT exempt boats in the EU if they're destined for charter or 'business'.
FWIW, the annual depreciation on your boat works out to about 8% VAT Incl. / 5.5% VAT Excl. In either case, that's not too bad for a five year old boat considering the biggest depreciation hit is right up front.