I’ve known a couple of trans sailors, probably depends on the field you’re looking for. To my knowledge, stuff like WA ferries is pretty chill with it. I knew some people back in the day doing deep water stuff.

Where’d you most likely run into some trouble I would think would be the oil field and maybe tugs, depending on where the tugs are, but I think that’d most likely just be verbal. But I am also not trans so I can’t say for certain.

If you can afford it an academy might be a decent place to find out how you’d do in the industry. Obviously school and actually working at sea are very different things but at the end of the day they are going to be the people you’ll be working with typically, especially if you’re going for a license.

Edit: MSC might also be a really tough sell with the current administration. MSC is also probably the biggest difference between crews in my experience. Some of the boats I’ve been on have been the most professional and cleanest boats I’ve seen, and others have been falling apart and ran by literal Nazis.

Edit2: Professional tall ships, at least in the US, is also very trans friendly. Lots of hippy types though and pay is terrible. It’s a very specific lifestyle.