gimme advice/examples for naval warfare (hex and counter)

I have a desire to experiment with my own naval warfare rules in a modern/WWII setting but with a few sci-fi premises.



Trouble is, despite what my name and avatar might indicate, I'm not actually all that knowledgeable about modern naval warfare.



Could you guys point me to your favorite cheap/free naval warfare rules that use hexes/squares and counters/chits so that I can draw inspiration from them?

gimme advice/examples for naval warfare (hex and counter)