It is Lk Superior. We have checked and rechecked. There is a lake I think in Russia that has more volume while Superior has more mass, or it could be the other way around. That lake however is salt.
If we could get some more people to check this out and then email me your opinions good bad or indifferent we sure would love it. We have about 12 right now but would love another dozen or even more if possible. My email addy is on the bottom of the test page.
Thanks