You can calculate your World Wide Locator using the data received from the satellites and the distance to the locator of your QSO with the Mercator method. Now you can see azimut between your locator and QSO Locator. Very important in contest with directional antenna. You can view through google maps the location of transmission of your interlocutor. Everything with this app.
Your locator will calculate only with gps activated. Your Locator will be calculated only with GPS enabled. Enable GPS before you open the application or once open when you require it.