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Ron,
For speedo verification, any GPS that shows speed will work fine. That includes the ones people use for hiking. If you want a full road map, point to point, talking one, they are not cheap yet. Any Sports Authority or Dick's Sporting Goods has GPS starting about $100.
As I said before, I'm sure someone you know has one, you just need to ask around.
Garmin and Magellan are the two big names in GPS, but there are other good ones out there. Check E-bay, I'm sure you can get one cheap there.
If your speedo is more than 5-6 mph off, you need a different gear on the cable.
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tfarhood
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