Sounds pretty much like a yacht remote control system. As for charter companies, I imagine it is possible for charter companies to code their vessels to return to base on its own. It will be really convenient for users, but seems dangerous in case of communication problems.
That doesn`t seem realistic and safe tbh. Certainly not with BoatPilot functionality, it doesn`t work with autopilot on such level.
Instead may be yachts can be remotely controlled by operators guiding the yacht to the base? That may be the case, the only questing is BoatPilot working range - I doubt it can reliably control a vessel from several kilometers away.