No doubt in my mind that the Sloop rig Mossie Yardstick is wrong with or without Spinnaker. The Association has tried to have it changed, but requests have fallen on deaf ears so far.

Yachting Victoria isn't doing it anymore, they are relying on information from a guy in NSW (who by chance once upon a time was a Mossie sailor), who claims to be using at least partly a European Measurement System to come up with the Yardsticks. But also has designed the Yardsticks around performance in over 15 knot winds, because that is what we sail in most of the time.