Surface Action is a set of free wargames rules for tactical surface combat in WWII. These are billed as simple, fast play rules.
The author writes:
This is a simple, quick play, rule set covering surface actions in World War II. The game is designed for use with 1/6000 scale ship miniatures. The time scale is 5 minutes per turn and the distance scale is 1000 yards to the inch. The game components include: Rules, tables and designer’s notes, and Scenarios.
You’ll also need some counters, which are easily made by marking up some pre-made blank counters. Specifically, you should have some counters numbered 1 through 12.