The 3 for 1 for liftboats applies regardless of the flag.
Generally, if the vessels is manned and operated per the higher ITC tonnage, it can be used. By "manned" we mean not just that the crew size and watch arrangements are per the higher tonnge, but also that the manning required you to hold a credential for the higher tonnage. In other words, if you can't man the vessel based on the GRT, and get credit for te ITC. If you were working on the vessel because your license was for the lower GRT, you probably won't be able to use that time to raise the tonnage based on the higher GRT you can't have it both ways.
You can probably go to Master 500 regardless. See 46 CFR 11.418, the limnitations on the topnnage of the vessels used is that one year must be on vessels over 50 GRT.
Keep in mind that if you are working foreign, you probably need STCW. In Nov. '09 we published a notice of proposed rulemaking that would substantially change the requirements for STCW certificates valid for Master 500. While this is only a proposed rulemaking, you might still consider whether it's better to act sooner rather than later. Even now, you wouild need to meet the current requirements for STCW.




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