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PHRF ratings vary from place to place. This isn't as weird as it
sounds, because a boat's relative performance varies from place to
place too. SJ23 versus Laser will be very different on a protected
inland lake than it would be on Puget Sound with sometimes big waves
and wind. So it isn't enough to just look for pure correction factors.
You need to start by figuring out what measurement you want to make.
The whole basis behind PHRF, Portsmouth, and other handicapping systems
is to try to compare two boats that are inherently unequal, and any
attempt to do that will have to include judgment, biases, and
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