I don't believe that GPS satellites are geo-stationary, otherwise you would always be able to see the satellites in your area, no matter what. They actually rise and set on a schedule. Some of the more sophisticated units take this into consideration. The Forerunner does an extremely good job maintaining at positioning considering its antenna is so small!

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Larry

Don't be afraid to ride too long or too hard. That's what cell phones are for. Rich Strauss