gps to scienidez.
I am obviously missing something here about coast and ocean tiles. Triremes and galleys can't normally enter ocean tiles (until Astronomy) and mine can't here.
So what has Mitiu got I haven't got?
Does that fishing boat confer extra ability?
You are partly correct about trirems and galleys, but that is not the whole story.
What Mitiu has that you do not is culture - triremes and galleys are safe in any square that has their culture in it.