Smart Island has a blue aperture.

An application is using the location service. Smart Island is a function of iPhone, which is located above the screen of mobile phone and is a small circular area. Smart island can be used to display some notification information, such as incoming calls, short messages, application notifications and so on. A blue aperture will appear around the smart island, usually because an application is using location services. When applications use location services, they will display a blue location icon on the smart island to indicate that the application is accessing the user's geographic location information. This blue aperture indicates that the application is using the location service and is getting the user's current location information.