The Beacons panel provides information about additional objects / devices / points of interest that are not UAVs but might interact with UAVs.
Beacon objects can be registered by Skybrush Server extensions, such as e.g. the RTK base station (which gets registered as a beacon automatically once its position is obtained).
Beacons are also shown on the map according to their actual position, if the "Beacons" layer is enabled in the Layers panel.
To navigate the map to a desired beacon, click on the magnifier icon on the right side of the panel next to the desired beacon name.