Bert in terms of a talk borderline perfect, massively technical topic that you made undestandable, you’ve got folks thinking bout fuzzing GPS (what could go wrong :-) ) and appreciation for those unrecognized that pulled the overnighter at xmas. Bloody well done!!
With modern phones it is really hard to sppof GPS signals. They will get their time via cellphone towers and the ephemeris from the internet. If they don't roughly match the received signal or the received signal is not as stable, your phone won't get a lock. Old receivers might fall for the spoofed signal though.
