I hold a 1600 Ton Mate and Third Mate limited to 2,000 GRT. 1600 GRT and 3000 GT (ITC) is listed on my 1600 Ton Mate, no ITC tonnage is listed on my Third Mate, only the 2,000 GRT.
You’re not going to get unlimited working on a vessel under the authority of your license. If it were up to your limitation, 3,000 GRT, that would increase your limitation to 5,000 GRT. You’re looking at being an AB watchstander on a vessel over 10,000 GRT for a year in order to do that. A vessel greater than 6,000 GRT would work as well, but I don’t know how much time would be needed without looking up the CFR and calculating it.
Once unlimited, the license would be good on any tonnage, GRT or ITC.
12 months on deck on any vessel over 1600 tons or 6 months as your highest capacity (3rd mate) over 1600 tons removes the tonnage restriction. I don’t know where you got 10,000 tons but what I just told you is right out of the cfr’s.
46 CFR 11.402 (c)