Adds massive cargo ships to the game, that function similarly to trains. Also adds deep sea oil, oil platforms, tanker ships, train bridges and other water based content.
Its very very annoying to make water ways by hand, even more so with the islands world mod https://mods.factorio.com/mod/islands_world, where i have to travel miles with a basic boat to make the waterways, but if this were a experimental feature it would make it so much easier.
Turns out, you can in fact get FARL to work if you don't mind cheesing the game a bit... https://youtu.be/8_-yB9RSV0E
Edit: Apparently this produces broken waterways that can't be deleted or used by ships. There are definitely compatibility features that need to be added to both Cargo Ships and F.A.R.L. for this to work properly.
If you have ghosts of waterways, Auto Track Laying should also work: Just load up your boat or ship with building materials (waterways, buoys, ports, floating poles) and they will be placed as you're moving along.