Phones do more than use the towers for location information, they use the data connection to download information about the satellite positions, shortcutting a 12.5 minute step:
I wonder if the average car system really has the sensors for high quality inertial navigation. If they don't, the navigation won't work very well anyway until it has a decent GPS fix.
https://en.wikipedia.org/wiki/Assisted_GPS
I wonder if the average car system really has the sensors for high quality inertial navigation. If they don't, the navigation won't work very well anyway until it has a decent GPS fix.