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Possibly we are not able to draw a similar comparison, but as a sports club, we may expect some benefits on the water.Let's compare our sailing event to a football match ( or cricket).
You do not expect somebody to come, sit on your grass and make a picnic just while the match is on.
This is exactly what is happening at almost every sailing session with anglers.
Maybe there is somewhere hidden rule/ law/ local customs that allow us to claim the piece of water or bank for that sailing event....
Maybe sort of flag, buoy could be considered for more organized events?