I believe anything not specifically for repair of a yacht in transit has been taxable in the Bahamas. Here's the actual rates:
Bahamas Tariffs, Duties, and Import Taxes
If you DO have repair parts shipped in...the box must have the yacht in transit information on it. Any Bahamas shipping office can point you to what MUST be on the outside of the bos for you not to get socked with duty on repair parts.
Don't forget to add the stamp tax 7% to the import duties.