Turn your device in combination with a DVB-T USB stick (RTL-SDR) to a real ADS-B receiver and show aircraft positions on a map.
www.ebctech.eu
DISCLAIMER:
NEVER USE THIS APP FOR NAVIGATION.
PLEASE CHECK YOUR LOCAL LAW IF RECEIVING OF ADS-B DATA IS LEGAL.
IN SOME COUNTRYS IT IS ILLEGAL TO RECEIVE SUCH RADIO TRANSMISSION.