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Elevation changes on flat track

Does anyone know why, when running laps on a flat 400 meter track, my elevation goes up and down about 20 feet per lap? It's completely flat, but I end up with a pattern shown in the picture.

0 tmk2 over 2 years ago

The Forerunner 735XT doesn't have a barometric altimeter, therefore altitude data that can be seen in garmin connect comes from a digital elevation map. This kind of map is usually quite crude and is probably inaccurate in the area you've run.