There is a very fun, and somewhat realistic global sailing navigation program. Look up sailnavsim. It is a sailing simulator not visual. (Except for maps.) You can join races, start a random race, and/or create your own races. By yourself, or against others.For example during COVID, we organized a open race from England to South Africa. The race runs in real time, so for open ocean races, depending on where you are going, it can take weeks. You leave your boat at a certain heading, then can leaner three computer - for an hour, a week, or whatever. But the wind can change. Using a wind map( link provided) you adjust your headings. Then check your SOG( speed over ground). If you're not careful, you might actuality go backwards. Also avoid Islands in the middle of the ocean( zoom in on the map.) So, in terms of navigation is quite realistic.