I can imagine scaling the tech up to deal with large ships is a lot more challenging.

But I'm posting this from a small boat with a pretty standard diesel engine also used in agricultural and plant vehicles, and something like that would fit in my engine bay...

We wanted to start by building a low-cost, modular device that we can retrofit onto existing semi trucks, since that's much easier than retrofitting onto a cargo ship or other boat. But we definitely hope to expand to mining haul trucks, locomotives, cargo ships and other bigger forms of long-haul transport down the line!