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Garmin says 4534ft
You can correct the Garmin if you have access to weather observations. For a short closed loop route, a reasonable estimate is obtained simply by comparing the altitude reading at the start and finish, which should be the same, and applying any difference as a slope correction to the data to compensate for any pressure drop
https://www.youtube.com/watch?v=QKacmwx9lvU
gbj_tester
Often wondered, after I complete a bike ride, why is the ascent stat recorded on my Garmin always higher than the ascent stat on the same Komoot route?
e.g Today I did a 53 mile loop, Komoot says its 3650ft, Garmin says 4534ft. Why such a disparity?
Presuming - hopefully - that the GPS figure is the one to rely on..?