Within the Information Technology (IT) area, is office automation software, for running the boat, such as email and other administrative applications, alongside that are welfare IT for guests and crew to keep in touch with the outside world through email, social media and browsing the Internet. Finally, there is Smart technologies, which tell us when a CCTV camera detects a person rather than just motion, or let the Stew know that the tumble drier has completed it's cycle, not to mention the all important streaming entertainment onboard.
Operational Technology (OT) would be used for controlling engines, radar, navigation systems, GPS, VINS, AIS and Satellite Communications.
There have been cases of ships being taken off course through the manipulation of GPS, of insecure navigation systems revealing the exact location of a vessel 24 hours per day, without using AIS and even one reported case in the South of France, of a superyacht being hacked through it's guest wi-fi, engines started and the only thing which stopped it being moved was that it was tied up alongside with old fashioned mooring lines.