Real-time spectrum data from the microphone (or external microphone) on IOS and Android device . Turning around device microphone must detect sources (stronges and weakest and show with arrow where to walk to find the strongest source . When you are 50 cm from the source press Record button and rms avg value of dB at pre-selected kHz will be saved in variable that will be used on other pages. User must enter data and store in local database and when Sync pressed also synchronise to web server via API.
Aplication will be developed based on existing Android app.
For more please read FS attached.