Found some information about the Cavotec MoorMaster automatic mooring systems installed in the St Lawrence/Welland systems in recent years:
https://www.youtube.com/watch?v=SHpJGZCY40I
And if you're thinking about ordering one for your bathtub or Jacuzzi, here's a brochure:
http://www.cavotec.com/uploads/2017/05/ ... 2017ld.pdf