Erta Ale is a remote and rarely visited volcano that is known currently to have an active lava lake in its summit crater. Erta Ale has undergone seven eruption events in the past 125 years.
Re: What are the differences between Signal ground, Chasis ground and Earth?? Signal Ground is a reference point from which that signal is measured, due to the inevitable voltage drops when current flows within a circuit, some 'ground' points will be slightly different to others. There may be several signal grounds in a circuit.
RF Signal Tracker is an engineering application for doing an impromptu hand-held *drive-test* with your Android phone. You can monitor and record the RSSI (received signal strength indication) for the phone as well as the serving cell locations, describe the cell site's zone of coverage, and save or playback that data.