My understanding is that as far as the USCG is concerned, a USCG Near Coastal license is only valid within 200 miles of the coast of the US. STCW takes the same position, valid with 200 miles of home country.
But some countries appear to be lax on enforcement of this in their waters.
The USCG needs to do a lot better job of communicating to owners and mariners what licenses are required for what vessels and voyages, and what mariners are authorized to do by their licenses. This should not be such a mystery.
I have had owners tell me that my license will not cover their vessel and operations when it appears clear to me that it does. And I have had owners tell me that my license does cover their vessel and operations when it seems clear to me that it doesn’t.
The USCG needs to clarify this.
The proliferation of both national and domestic endorsements with conflicting GRT and GT tonnage limits has everyone confused, including me. Add to that confusion dual tonnage vessels with both GRT and GT tonnage admeasurements.