Yes, I meant a safety lines.
I thought Jack Lines was the correct term but when I googled it to be sure I found out JL's were used on Square Riggers to hold gaff booms up.
Thanks for the advice. I sorta thunk (sorry, starting to talk like a Mississipian - been on this boat wayyy too long ) that using stretchy lines to stay aboard was inherently incorrect. I will have a look for crane strops on the www.
I am on an oil
rig so I will go and chew the fat with the crane operators tonight. However I don't think I can easily sneak off with 20 meters of crane strop in my luggage.