See also:

Tachometer
The tachometer displays the engine speed in revolutions per minute (rpm). ...

Horn
Press near or on the horn symbols on your steering wheel pad to sound the horn. ...

Other Navigation Services Available from OnStar
OnStar eNav: Allows subscribers to send destinations from Google Maps™ and MapQuest.com to their Turn-by-Turn Navigation or screen-based navigation system. When ready, the directions will b ...