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[pct-l] GPS, distance and speed.



Well, I have two GPS units, one about 7 years old (early Garmin 12XL) 
and a newer Garmin etrek. With either one, I can stand on the beach a 
few feet above sea level and gett elevation ranges from -100 feet (yes 
supossedly below sea level) to about that much or move above. It seems 
in low end consumer units at least, the altitude accuracy is not very good.

John