I don't know if my 10-year old boat is "modern" or not, but she has reasonably good ventilation -- six big dorades. In cold weather
I have to stuff rags in them.
There are not really many options -- hatches and dorades. My boat, sadly, lacks the opening forward-facing saloon
windows of the Oyster
I almost bought before finding my present boat. Now THAT'S ventilation when you need it.
You might consider rigging wind
scoops. These are generally for use at anchor
, but you might make some which are shorter for use underway. The challenge will be to avoid interfering with the rigging
If you don't have dorades, I would seriously consider retrofitting them. Without dorades, you won't have much, if any, ventilation though the boat when you're not on board and the hatches are locked down. That seems to me like a sure recipe for mould, mustiness, mildew, and stink.