When a province is first discovered by a person within a tech group (latin, eastern, chinese etc) then it will take however long you set the spread of sea provinces to for that sea province to be visible to every member of that tech group who hasn't seen it yet.
That way if you set it to 50 years, even landlocked Switzerland will know about the Caribbean 50 years after Portugal uncovers it, but non-westernised Ming won't know about it since they're in a different tech group.
Exactly the same goes for the spread of land provinces.
Neither setting has anything at all to do with cores.
That way if you set it to 50 years, even landlocked Switzerland will know about the Caribbean 50 years after Portugal uncovers it, but non-westernised Ming won't know about it since they're in a different tech group.
Exactly the same goes for the spread of land provinces.
Neither setting has anything at all to do with cores.