Wouter,
<br>How about something like:
<br>
<br>"Each boat must have a suitable means of being righted by its crew in the event of a capsise."
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<br>That way it's up to the crew to decide what they are going to use as a suitable means. Having a righting line may be a waste of line if the crew isn't heavy enough to right the boat with it. In this case they would also be required to carry additional assistance, bag, pole, whatever as long as it made it possible for the crew to right the boat.<br><br>