I've heard of that one before but hadn't looked into it. I had to close the tab pretty quickly to avoid buying it, because it actually looks pretty fun.
These games are for obsessive-compulsive Asperger's types (like myself). I'm not really into them (I don't really play any games any more in general) but I totally understand the appeal.
I played a lot of MS Flight Simulator (and Flight Unlimited and its sequels, which were more fun) as a kid, and got a lot of enjoyment and even fulfillment out of it. At the time, I found heavily story-based games not particularly interesting, and mainly played games that offered some sort of sandbox on top of any story and missions (a lot of first person shooters fell into that category in those days).
I also had a sailing simulator game that was awesome - you chose your sailboat (and there were lots to choose from, and lots of community-made ones) and then just cruised around the south of France or wherever. It had submarines and torpedoes and stuff too, because of course it did.
Apparently it's still around, and has undergone a lot of updates since I last played it about ten years ago: http://www.hangsim.com/vs/ - and they have a Robot Simulator now: http://www.hangsim.com/rbs/ (I believe their original sim was the "Hang Sim" of the URL, for hang gliders... I remember playing it but wasn't as drawn to it as the sailing sim).
I think I'm going to try it again, because lately I've been really interested in actually learning how to sail (cue "I should buy a boat" cat). MS Flight SImulator taught me how to fly (it helps that my dad is a pilot and took me flying in small planes as a kid), so why not.