Unlimited tonnage ugrades

So I have been doing some research concerning sea time and have reviewed 46 cfr 11.402. It states that only have of the required 360 days must come on vessels of greater than 1600 tons to avoid a tonnage restriction. So my question is can I use 10 months of unlimited time and 2 months on a vessel of 150 tons to upgrade from 3rd mate unlimited to 2nd?

Thank you in advance for any guidance on this issue

At least 1/2 of the required time must be on vessels > 1600 ton. The rest may be on limited tonnage vessels > 100 tons, but if memory serves, depending on if inland/near coastal/GL it may count at a 2 for 1 rate. Meaning you may need 2 days to equal 1 day, depending on whre you actually sailed.
I had 25 years as Capt. on 1200 tons inland vessels, and that counted as 180 days twords my 2nd mate upgrade.


Checklist for 2M Unl.