I attach a Double Mamba to my harness, and use it often.
I also have a short tether permanently attached to my offshore
life jacket. It works great and comes in handy attaching things
like handheld VHFs.

I picked these up after I almost lost a crew overboard. She was
hanging onto the shrouds being dragged through the water. I
found I didn't have the strength to haul her up with one arm.
So I decided I needed a short tether.

http://www.northernmountain.com/NMSM...at=CLC&SubCat=


"Michael" wrote


2) Instead of relying on the single length tether on your safety harness
put
one in the cockpit (two if the foreward one won't reach aft to the wind
vane
etc., one by the vang, one by the stays'l and one by the jib/forestay and
anchor area plus one by the mast. Make each one the right length for what
you are doing. For example the one at the mast should be short, maybe a
foot
to 18". Then use the regular one to get from spot to spot along the
jacklines. (side note ) I learned to run a second line from the upper end
of
the bow pulpit up to just about elbow height on the lower shroud and then
down to the pushpit. Set so that boom and jib sheet etc. clear. When go
forward in rough seas you have deck jackline, toe rail, two lifelines (to
30" high) and this higher line so you are caught toe, above the knee and
just below the shoulder.