The GPS receiver uses the WGS-84 reference ellipsoid Model of sea level to calculate Elevation. This model has a smooth spherical shape and this means that the "altitude" value displayed on screen is the elevation above this Model and not the real sea level. The shape of the earth is an ellipsoid and not a smooth sphere.
This download is completely safe. TennyApps is the official developer of the app that can be found in the Travel & Local category. People rated Elevation 3.4 on Google Play.
The tool was downloaded and installed by over 5K users and its most recent stable release was on Oct 6, 2020. Adverts are a part of this application. Download the installation package of Elevation 2.17.16 that is provided for free and have a look at users' reviews on Droid Informer. The app is designed for Android 4.0 and higher.
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