I don't know about waves but I was WAAAY out side NW corner in about 1700 ft of water on Thursday drifting for those loco toothy critters and had 2 Riso dolphins come up about 18" from my bow with no warning... no real waves but the splash and wake did scare the crap outta me, as I was dozing!
I don't know much about the Riso's but they are quite a bit larger than any of the other dolphins or porpoise that we usually see out there.