Thanks Michael and Dave. Some of the links in Michael's original post are broken but a simple google search for "climbing aiders" returns a variety of simple webbing ladders which are pretty darn affordable. I really like Michael's approach to having an aider physically attached to your harness. That way you can make use of it no matter where you wind up outside the boat. On my boat if I went over on the foredeck my tether would be brought up against a lifeline stanchion before I got 10 feet or so from the bow. I would have to install several ladders in order to cover the possibilities. There is no way I would want to unclip to get to a ladder.