In my own opinion (IANAL), the "tracking is a "search"" view does not imply that there needs to be a physical device. So tracking a vehicle (using technology) in any other way is also a "search".
I'd agree. Tracking through any physical method (IE through an OnStar device or built in cellular with GPS) would have to go through the vehicle manufacturer or service provider, which (if the companies behave how they should) should require a warrant simply to receive the data in the first place.
The greatest concern would be when surveillance satellites could be used to track cars inside a city. Or using CCTV traffic cameras for a live-tracking of tagged license plates. The question is would this tracking actually constitute a search. Because a warrant doesn't have to be issued for an undercover cop to follow a car, only probable cause. So does 'probable cause' extend to digital tracking through a CCTV grid, satellite or combination? That's where it gets creepy to me, because IMO this likely won't constitute a search.
