This is a real-time naval warfare simulator based on HarpoonII.
It models pretty much all aspects of naval and air combat.
It is based on Harpoon II, with many bug fixes and improvements. Harpoon II was based on the Harpoon war game rules created by Larry Bond and Chris Carlson.
The interface is a windowed Graphical User Interface, with graphics modeled after those found on modern US Navy war ships.