Check this out, I programmed this naval sim more than 25 years ago!
http://www.virtualapple.org/greyseasgreyskiesdisk.html
Notes: This is a text-only game. The 'map' is a simple Cartesian grid with coordinates measured in yards (get out your graph paper, guys). Each game turn represents 2-minutes.
(The link above is to an Apple II emulator that requires Sun Java. If nothing happens, you probably don't have Java installed.)
