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Old 01-07-2013, 02:51 PM
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east tx skier east tx skier is offline
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Join Date: Jul 2004
Boat: 1998 Ski Nautique
Location: End of my rope.
Posts: 25,278
For free skiing, it affects how fast I am moving relative to the water. A boat traveling at 34 mph on the gps in a 2 mph current feels faster or slower to the skier depending on if the boat is traveling with or against the current. Having a traditional speedo (assuming I calibrated it in open water) to compare to the GPS gives me an idea of how much I would want to adjust the speed control to counteract the current.

This is a nonissue in a slalom course since speed over ground, which GPS measures, is all we care about. But in a slalom course, I'm relying on speed control and not paying much attention to my airguide.

Not bagging on your idea. I actually think it's really great. I'm just pointing out one of the advantages, for some, of having a traditional speedo in addition to a GPS speedo.
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