Cars fitted with OnStar's technology will be tracked even if the owners don't sign up to the service, in a change to the company's policy that will kick in come December. OnStar is a service offered by General Motors USA, which inserts a mobile phone, along with telemetry tracking kit, into cars sold by the company. Owners are then offered the option to sign up to the navigation and automatic crash reporting, but in a policy change the company will start collecting data from drivers even if they haven't signed up for the service. In the notice being sent out...