Alert when about to enter new airspace

Feature: As a pilot I want to get a visual and audible alert when I am about to enter a new airspace, so that I can take all necessary actions ( correct in case of mistake, communicate with authority… ).

The range of the alert should be configurable as parameter.

This function is implemented in Foreflight Map and provides audible and visual alert when entering a new airspace, with details about the authority for the airspace (e.g. frequency). In case of VATSIM / IVAO integration it would also be nice to know whether the said authority is online.