It is not valid. First of all, outside the US, a US Master's license
, not a six pac (OUPV) is necessary. Second, outside the US, you need an STCW. Third, if based in the BVI
, you need a BVI
, which, however, can be gotten as a reciprocal to your Master's license.
None of this is obscure. You can contact the Virgin Islands Shipping
Registry at 1-284-468-2902 to satisfy your curiousity, but I actually thing it is the USCG that says the OUPV is invalid for international use. Both will tell you about the STCW.