Or not. The measuring requirement is arbitrary. You could drop it all together or have a challenge provision.

I wonder what would happen if you dropped the measurement requirement, someone tried to cheat, and the rest of the fleet refused to sail?

Some years back there was a Hawiian paddling canoe competition. Those boats have rounded bottoms. A Tahitian, V-bottomed boat paddled out onto the course and the Hawiians promplty went back to the beach.

I'm just sayin'...