Naval Fate.

Usage:
  naval_fate [options]
  naval_fate ship
  naval_fate ship new <name>...
  naval_fate ship <name> move <x> <y> [--speed=<kn>]
  naval_fate ship shoot <x> <y>
  naval_fate mine (set|remove) <x> <y> [--moored | --drifting]

Options:
  --corner-cases   It's testing "quotes"
  -s --speed=<kn>  Speed in knots [default: 10].
  --moored         Moored mine.
  --drifting       Drifting mine.