I don’t know anything about sailing vessels this size either, and maybe the rules are different. But, I agree with rebel heart and roverhi about life jackets not being enough.
On our 34' boat the rule
was no one goes forward while under way without a tether even in benign conditions. The reason was a lesson that my grandfather’s buddy Phil taught me and my sister. Old Phil taught my sister and I to sail on his 30' wooden sloop
in Narragansett Bay a long time ago. We were required to wear life jackets and we hated that part. One day he took us out about five miles, threw a life preserver overboard
, waited awhile, and then told me to take the helm
. It was a man overboard
drill and it was my job to find the life preserver. We had 2-3' seas, moderate winds, and it was a bright sunny summer day. I easily brought the boat about, my sister trimmed the sails
, and I sailed us back on a broad reach ........ and couldn’t find it. Phil took the helm
and told me to go forward to the bow and see if I could find it. I scrambled up to the bow and - nothing . Then he sent my sister up to the bow to help - still nothing. At that point Phil shouted, "Hey kids
, if you go overboard, do you think I’ll be able to find you? Why don’t you come on back here and I’ll tell you guys all about tethers."