MLapla4120 wrote:
1. glow in the dark handle
2. floats
3. locking marlinspike
4. blade half serrated and half smooth
5. opens with one hand
6. place for lanyard
7. can be held by one's teeth
8. easy to open sheath
9. locking shackle wrench

what do you think? where would I get one?

Strange - the ability to hold a good edge is pretty high on my list.

I'm not sure about floating - I would think that a knife dropped
overboard underway would be lost even if it floats. If you tend to drop
tools at the dock you should use cheap tools. Perhaps if you didn't
carry it in your mouth? Most floating knives are "survival" knives,
not well suited for rigging work.

My newest knife doesn't have a locking shackle key - I thought that
would be a problem, but you only need to apply force in one direction.
I like the non-locking because its easier to fold. Some knives have a
hole in the blade as a shackle key - this seems handy but rather dangerous.

Another issue is non-ferrous, although there are only a few that can
hold a good edge and not affect a compass.

I've ended up having a variety of knives - a quality pocket carry, a
large rigging knife that usually stays by the companionway, several
cheap serrated blades stashed in the chain locker and cockpit rope
locker, etc. I'm still looking for a good knife for curring away fouled
fishing gear from the props and rudder.