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Key details regarding GPS altitude:
Measurement Method: GPS calculates altitude using signals from at least four satellites to determine 3D Cartesian coordinates, converting them to latitude, longitude, and height.
Accuracy: While useful, it can range from several meters to hundreds of meters in error depending on satellite geometry and receiver quality.
Geometric vs. Barometric: GPS altitude is a geometric height above a mathematical model of the earth, whereas barometric altimeters (used in aviation) measure pressure altitude.
Usage: It is often used for navigation and, in some cases, provides a more accurate absolute altitude than a poorly calibrated barometric altimeter.
[Chuck Darling March 4, 2026]
[Chuck Darling March 2, 2026]
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