I noticed that units such as Inf. etc. can upgrade at sea while transported. I have no serious problem with that (as far as improved doctrines goes, it should not matter and for the better equipment, we can simply assume it is coming on the next ship anyway).
However I tough I would mention it in case it was not supposed to be possible.
AlvaroSousa -> RE: Upgrade at sea (6/1/2021 7:47:10 PM)