Somewhere, there's an antenna that can be unplugged or isolated.

Says the member that posts on an open internet forum, from a non scrambled or encrypted device, through an ISP. . .

I'm not posting my exact location every minute to Generic Morons' servers, last I checked.

BTW - I was responding to a post about key fobs, which aren't a privacy issue (like On*Star) as much as a security one, since there are devices that allow unlocking of a vehicle without the proper key fob.