Oceanus Strategoi : Nice rules which could work well with 1/300. These have taken a lot of thought to get the game-turn sequence sorted out. This is crucial in getting an atmospheric and accurate game so I-Go-U-Go wont work. The solution here is designed to work with a multiplayer game and seems rational enough but the rules include detailed method for working out complex interactions. These rules are concise, though.
A nice aspect is the idea that a ram atack is uncertain in its success from the start and an aspect often missed is the observation of an attack by the victim before they can react.
I am less enamoured of using 'factors' for crew and many things are calculated using formulae - even though these are fine and seem realistic in themselves. These rules are wel worth a try, free, concise and cover most things one would want. There is little 'colour' in them, however.
Ramming Speed are short and sweet with less complexity than OS. They are for 15mm ships and could be said to be 'skirmish' level rules.
Most things are dealt with ina straight-forward manner but because of the 15mm scale deck fighting and shooting would require some changes for 1/300 to emphasise groups instead of individuals perhaps. The rules allow sailing in connection with a battle.
Complex moves would be a problem in 1/300 I think because each inch of 1-24 inches possible is ordered and moved individually.
Probably a fun set for 15mm or Zveda's 1/72 models.
Andy Watkins Trireme rules are great. Deceptively short and sweet. He does prefer a hex grid which gets him out of some movement problems neatly but this is a nice rule set.
The game turn sequence is dealt with very nicely - almost the same solution I have devised - but is unclear on resolving problems with ships moving at the same speed. Shooting and fighting is simple so the next turn can be reached before long. These would be my preferrred rules with my old navwar 1/1200 and Andy has nice pics of his own Langton models on his webpages. There is little complexity but most things are dealt with and fleet action could be done with some excitement generated. However, they are not, without some modification, what I would use with 1/300ships.