Maybe the lat/lon URL parameters would be a good thing to standardize on, actually. Having feeds tailored to your location makes a lot of sense on other mobile platforms than just cars.
Sending the car ID isn't nice, though.
Sending the car ID isn't nice, though.
Or gather data on average speeds and numbers of journeys by time of day for capacity planning.
It can be used for evil; but there are legitimate uses too. it's a hard problem to get the data out to only where it can do good.
average speed, location (are you in the middle of a park, or traveling 65MPH very near to a highway?), ambient noise,etc
Either way, it's an easy problem to let the user decide if they want to be tracked -- an easy problem Nissan chose not to solve.