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Index of Subjects Hi, Jamie- Elevation measurements from GPS are significantly less accurate than lat-long measurements. This is due in part to the geometry of the situation, and in part due to the fact that the GPS system calculates your distance from the centre of a sphere, and then applies a model of the earth's surface to correct for the earth's radius at your location. There are other sources of error as well. There's lots about this on the net of course. Until you understand the nature of the errors it's probably not a good idea to put too much faith in what the GPS receiver tells you for elevation. If you wanted to get a good result, you could rent a surveyor's level and work your way up to your house from the nearest known accurate elevation. Peter Payzant
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