A method to detect application spoofing in a mixed use avionics display by indicating when a mixed use avionics display is displaying information from a non-certified source. The method comprises providing an avionics display having a display area that is capable of displaying information from a non-certified source. A data connection is established between the non-certified source and the avionics display. Information is provided from the non-certified source to the avionics display through the data connection. The information from the non-certified source is then displayed on the display area so that less than the entire display area is used in displaying the information. The displaying of information from the non-certified source on less than the entire display area gives a visual indication that the information being displayed on the avionics display is from a non-certified source and susceptible to interference by a remote party and possible application spoofing.