Why limit the use of the Magnetic Sensor snuggled in your phone to just a simple navigational compass ?? !!! Broaden its scope to locating hidden metallic objects in your vicinity.
Turn on the app, swipe it over the search area and hear it beep on locating a metallic object (ferromagnetic metals like iron, nickel and cobalt and their alloys).
The App also doubles up as a simple and useful security aid that fits in your pocket !
Want to rid your conference table off spying bugs? Use your phone to scan for mics and cameras! (emfs generated by electronic devices)
An App that even Bond would want !!!