To illustrate: Airplane pilots know that if they get lost, they can communicate with air traffic controllers to get help.
يَعْرِفُ ٱلطَّيَّارُونَ أَنَّ بِإِمْكَانِهِمِ ٱلِٱتِّصَالَ بِمَرْكَزِ مُرَاقَبَةِ حَرَكَةِ ٱلطَّيَرَانِ إِذَا ضَلُّوا طَرِيقَهُمْ .‏