Geoid vs Ellipsoid: Why Your GPS/GNSS Elevation Is Off by 20 Meters

Bench-Mark Equipment and Supplies — public instruction filed under Geodesy & Datums. “Geoid vs Ellipsoid: Why Your GPS/GNSS Elevation Is Off by 20 Meters.” Watch the module, then pass the topic quiz to post CE credit. The quiz checks the professional subject, not a transcript of the video.