The more sophisticated recorders like the ELEKON BATLOGGER M will also provide more information about where the bats calls were recorded, such as the temperature at the time of the recording and the GPS co-ordinates to provide the exact location.

This sonogram expansion shows two bat calls together with the temperature, the date/time and the precise location on the map where the recording was made.

A good reference book on bat sounds is “British Bat Calls” by Jon Russ.