Yeah, well I used to be able to. I recall planing continuously for over an hour at various times.
That's the point of that idea, to see who can plane through all their gybes.
I'm not sure if the GPS units would be able to assess that, but my thought was to set a minimum speed cut-off of 12-15kts to monitor it. Of course, you would not really need a GPS to do that, just a witness, but the GPS would provide hard evidence.
Twas just an idea.
Conditions would play a big part, of course, but that is true of all these disciplines.
Of course, a massive downwinder might also provide a good strategy, which would only be fair too.
Both ideas are about getting people on the water, and honing technique.
