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Presuming GPS is the one rely on
GPS is terrible for altitude measurement due to geometry, so most Garmin units use a barometer instead. The barometric altimeter on a Garmin is pretty good in general for counting ascent/descent, but it can't measure absolute altitude and is fooled by changing weather, so it attempts to re-zero periodically by GPS.
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Your Garmin is probably using air pressure to work out elevation gain and kamoot is working it out from the GPS/map data
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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..?I did the same 200km ride with 2 other people with Garmin GPSes. We had three ascent figures of 1400m, 1800m and 2200m.
The ride distances differed by +/-10km too. All of us rode together the entire time, no-one left their GPS running whilst leant against a wall or at a food control or anything.
tl;dr the cumulative error on GPS measurements adds up quickly...
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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
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gbj_tester
greentricky
Greenbank
@Kit!
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..?