There was recently an article in Cruising World about night vision. I thought, much too expensive!!
My wife came across Pulsar Recon night vision 325R (IR type that can record) at an incredible price. I said what the heck, we can always send them back. I got them yesterday, and they are quite good. The field of vision is narrow, but in the middle of the night I can easily see 75 yards down if not more with the IR light included. I am sure it will do better with something generating heat.
They are on sale at Nieman Marcus (which is clearly the marine outfitter of choice) for $300. No connection etc. I think they will help going into harbors at night and looking for lobster pots.