Some of the services available through the OnStar system include turn-by-turn navigation instructions, automatic crash response, and roadside assistance. All of these features are accessed by pressing a blue OnStar button, a red emergency services button, or a hands-free calling button.
General Motors established OnStar in 1995 with cooperation from Hughes Electronics and Electronic Data Systems, and the first OnStar units were made available in several Cadillac models for the 1997 model year.
OnStar is primarily available in GM vehicles, but a licensing agreement also made OnStar available in several other makes between 2002 and 2005. A stand-alone unit was also released in 2012, which provides access to some of the OnStar services.