This GeoLocator Data Package contains the raw data from a single barometric pressure logger deployed on a White-chested Alethe (Chamaetylas fuelleborni) in Kimboza Forest Reserve, Tanzania. The dataset accompanies the study by Jensen & Werema (2025), which documented seasonal altitudinal migration between lowland and montane forests in the Uluguru Mountains. As the study focused on local elevational movements, no GeoPressureR analysis was performed and this package contains raw logger data only.