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Important! Get Locus Map permission for all-time access to location and exclude Locus from all means of battery optimization so that the app can run in the background. Instructions on how to do it are summed up here or here.
Locus Map processes location and elevation gain from the data it receives from your phone GPS. If the data are incorrect or contain massive deviations, the resulting location fix and elevation gain are incorrect. Locus Map, however, offers a few methods on how to limit these deviations.
Open Locus settings > GPS&sensors and set the following