Yes,  the error is almost certainly due to the difference between the true 
earth surface and the value calculated by the GPS model of the earth surface.  
The difference is Dallas, Texas is around 26 meters  (and John Miles actually 
does live in a pineapple under the sea,  so his altitude is negative ;-)

You should use the value determined by the GPS as the altitude that you enter,  
not the true altitude.  

                                          
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