It is worth noting however that the size, power consumption and antenna precision of a watch-sized or bicycle computer size GPS(+glonass, Galileo, beidou, qzss) receiver is considerably smaller than what should be in these vehicles.
I have not seen any mention of GPS service degradation in hobbyist drone enthusiast groups over the last week, some of whom use quite small GPS modules with serial connection to the flight controller for automated signal lost return to home features and such.
They're almost certainly using dead reckoning with wheel rotation sensors to get the precision they need in an urban environment where radios are kinda trash.
Tesla’s also use dead reckoning when GPS is lost. It’s way more accurate than I would have guessed. My GPS antenna was out for over a week and the map was only about 100ft off.
I have not seen any mention of GPS service degradation in hobbyist drone enthusiast groups over the last week, some of whom use quite small GPS modules with serial connection to the flight controller for automated signal lost return to home features and such.