While cruising out of the channel, we were scoping out how the Coast Guard removed a green can, that was the only marking of the entrance to the channel. Looking about and then BAM! Very loud noise. I knew we hit something, but what and how bad. I motored away with no vibration, so I took the throttle up to cruising speed and again, all seemed fine. We continued on our way, had a super day and got back to the marina. After we docked, I donned the mask and fins and got a bit sick over the port prop. Pretty mangled up. So, we emptied the refrigerator, called the marina for a haul tomorrow and need to send the prop out. I wished I had a spare but don't even know what I have. My Carver book just says 22 x 22. So I guess once we get it out on the hard more information will be uncovered.