Was fishing Sandy Point Thurs. and there was a Coast Guard hail for a sinking sailboat. I pulled up my lines and cruised around Sandy Point looking but none in sight. Call was cancelled later. When coming back a huge car carrier coming south from Baltimore was moving a lot faster than expected. It threw 3 huge waves up into the 20 ft area I was boating. I have a 27 ft boat and the first wave was as high as the top of my windshield. When I motored over the first into the trough the next wave was almost as high as my t top. Water poured over the decks and was scared the wave would throw me sideways even though I was applying pleny of throttle and cutting it at an angle. Third wave was big but not like the first two. I've been sailing and fishing the bay since the 80s and have not seen large ship wakes like this. Not sure if this was their pilot error or ships pick up speed later in the fall. I'm posting in case folks are not paying attention to the size of some of the wakes and I know I'll be wearing my life jacket in the future. I was happy I was not anchored when he rolled thru.The big suprise was the depth of the trough between the waves. In a smaller boat I'd be swimming.