Have you looked at the Seattle area / PNW as a use case at all? I imagine the geography would be perfect for a solution like this.

Seattle has a pretty extensive ferry system that they are in the process of electrifying [1]. It's great for what ferries are, but I would love more options between islands. Some of the less popular options are limited seasonally, I imagine this is a matter of economics.

Also I can tell you that the ferries to / from Victoria Island fill up fast and require reserving slots in advance if you have a car. It's also a 3-ish hour ride that can be very unpleasant if you hit bad weather. I've often driven the long way around rather than do that trip.

[1] https://wsdot.wa.gov/construction-planning/major-projects/fe...