In the grand scheme of things this is meaningless, and maybe it's just me, but...
Why is it impossible to line a boat up exactly on 90 degrees? Or 180, 270, etc.? On long hauls across oceans it offends my OCD greatly that I can't point the point exactly (or darn near exactly), east or west or north or south. The closest I can get is to within 4 or 5 degrees of exact. So I am hoping somebody can tell me that there's a way to more precisely line up a boat, some finer control of the boat's rotation or something. Anything. This will kill me, eventually. Ugh!
EATS roads officially died the final death when they introduced the new boats. The reason has to do with how the boat sits in the water, it's lower than the old boats so now the game thinks you're underwater and basically forces it downwards (old boats would rise to the surface, new boats sink to the bottom.)
This is also the reason why submarines are also not a thing, which Etho explored in his EATS revisitation episode in his let's play series.
DuhDerp is correct about the changes to boat mechanics killing the EATS, however EATS roads required (IIRC) very precise alignment of the boats to function properly and it is that aspect of the boat launcher builds I thought you [Glendromeda] might find useful… (although they may require some adaptation). [The boat alignment issue has never been sufficiently annoying to me that I was motivated to try this and my EATS experience (and therefore knowledge of the details of the launchers) is quite limited.]
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.