Demonstration of the risks of excessive reliance on GNSS in general and more specifically GPS by a spoofing experiment. For the first time I have seen that some mobile phones rely on GPS time to set their clock (rather than using the GSM network) and keep this information until they recover a genuine GNSS signal.

Slides of the presentation at

These slides were cited in a news published by the France24 French TV-broadcast network reporting on a potential spoofing attack in the port of Shanghai [in French]:

Auteur : JeanMichel | Date : 20/11/2019