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WAAS and altitude accuracy?

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Anyone had any experience with the accuracy of altitude using a WAAS enabled GPS unit? It was, I think, tauted as having accuracy to within 10 cm. Don't know if there is anyway to 'program' an altitude though. Still toying with the idea of an automatic landing system. Found a 'garage parking device' at Walmart -on sale for $10-which is a sonar device which goes from green (led's) to yellow to red through a distance of about 4 or 5 feet (green) down to about 1'. Haven't gotten around to reading the voltage output yet but the concept would be to couple the individual LED output to the elevator servo, through some circuitry.

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