These games are either completely free or offer significant free-to-play versions that you can download today: Cruise Ship Handling | Download and Play on PC

While some games offer free trials or demos, full "hot" downloads for free are often limited to mobile-style ports or older demos. Top Ship Simulators with Story Modes Seafarer: The Ship Sim

The beauty of a free ship handling simulator is that it usually runs on a potato PC. However, here is a baseline:

If you want, I can: