GPS transmission kit has been available for not too much money for quite a while
The LabSat kit from RaceLogic is excellent. I have several of these boxes here at my lab. Battery powered too, so you could drive around with it transmitting that you are in the middle of Milan at 3.25pm last Thursday doing 40kph down a particular street.
Not that I'd ever do that when stuck in traffic, cos it would be bad and wrong.
(interesting to note that iPhones and cell-enabled ipads take their date/time from GPS, not from cell network or IP clocks)
https://www.labsat.co.uk/index.php/en/
Biting the hand that feeds IT
