There are 2 sets of rules with this name.
Ramming Speed[]
The Jackson Gamers have used these for 15 years, along with home-made 15mm War Galleys to have great fun.
http://www.angelfire.com/games3/jacksongamer/ram_speed.htm
Ramming Speed[]
This is a quick play rule set for Ancient Naval Wargames. Its meant to be fun and flavourful.