If you have a 200 ton USCG license with an oceans endorsement will you have to retake celestial test to upgrade to 1600 ton oceans?

I say yes, but of course, you should either check with the USCG or a consultant (i.e. maritimelicensing.com). Here is my reasoning for yes: For a 200 ton license, oceans, you did not take the same celestial exam modules required for the 1600 ton license (216XX). Also, you are upgrading to STCW OICNW, which also requires the celestial exam for the oceans endorsement.