1 Destination Download is not available for ADAM, Corsa, and KARL. An embedded Opel navigation unit and map data are requirements for this service. The OnStar Services require activation and are subject to mobile network and GPS coverage and availability. Charges apply after the free trial period. The OnStar subscription packages could be different from the services included in the free trial package. Some features may not be available for certain carlines or trim levels. Terms and conditions apply.