When I kept my boat there for more than a year, I paid the $500 renewal fee, which I believe you can continue to do for up to three years at which time you must either take the boat out of the country or pay the import
duty which I believe is 10%. You can of course pay that duty sooner if you feel you will be keeping it there long term. When I renewed it (Green Turtle), they accepted cash only.
I believe that's still current
, but you should double check with official sources. The other problem is that new regulations
don't always seem to be enforced the same everywhere. For example, it appear some boat in the 30-35 foot range have been charged the new $300 first entry permit while some have recently been charged the old $150.
With a 44 Cat, I should think you would want to pay the renewal fee, not the duty and take it back to the states before the 3 year limit.