Ok...I have gone overboard unitentionally...
I'll tell you about it and then about how I try to avoid it now.It has been 35 years since then, but I can recall it as if it were yesterday. I was 19 and was either crossing from Port Everglades to Bimini or running up the coast from Key West (I don't remember which trip, but we were not in sight of land). I had the dog-watch with the owner/skipper and our other crewman below, asleep in the cabin. We were making about 5 knots in about 15 knots of wind, clear skies and 3'-4'seas. I had the tiller tied off and clumsily slipped overboard while standing on the boomkin, occupied as the vast majority of folk who go overboard in mild weather are (though I was stone cold sober). Fortunately, it was our practice to trail a 1" fifty-foot long warp with knots tied in it every 3' at all times while off-shore.I was nineteen, a former competitive swimmer and experienced commercial diver. I could swim three lengths of an Olympic pool under water in one breath. Yet, at 5 knots, it was all that I could physically do to drag myself back up the line and climb aboard. At that speed, a swimmer hanging onto the line is constantly submarined. It is very difficult to get a breath and the drag force is incredible. Initially, I thought it was kind funny in a stupid way. But after advancing a couple of knots up the line I became concerned. Before I was half-way back to the boat, I was having doubts. By the time I made it all the way, I barely had the strength left to get my foot on the boomkin bob-stay and haul myself aboard. I was utterly exhausted and humiliated at the stupidity of my arrogance.I'm still in pretty decent shape, but I doubt that I could hang on and keep breathing for very long now...no matter how much adrenaline is pumping. I would be very concerned about being clipped to a line that was dragging me along.I have a Catalina 320 and wear an automatic inflatable vest with integral harness when single-handing or in any rough weather and in moderate winds in cold weather or at night.I have twin jack-lines with clips on one end and I have them tied together in a knot about six feet from the clips, which I snap on the bow cleats. This keeps the tether short when I am at the bow. I run them back on either side of the mast along the centerline, over the dodger and bimini, then tie them to the split backstays. This keeps the tether short in the cockpit and along the sides. The short tether keeps me in the boat...period. Yet, I have access to all parts of the boat.If I am reaching or running, the leeward jack-line has to be run inside the mid-boom main-sheet. You have to keep to the windward side, or unclip if going forward on the lee side. Other than that, is not a problem unless I have to jibe frequently.I have found that the process of running the jack-lines and clipping on makes me far more attentive, less careless and I seem to hold on tighter. It seems as if I slip or lose my balance far less when clipped on.In light air at night with crew aboard, I trail a 30' dock line with a knot in the end and wear a light-weight manual inflatable vest.