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TomTom is extending its current business of portable navigation devices into the embedded automotive navigation domain. Portable navigation devices have a high pace of innovation and moderate diversity. Automotive devices traditionally have a slower pace of innovation and high diversity. Their integration in the vehicle needs to comply with formal and intrusive automotive requirements. How can both worlds be combined, offering an increased innovation and reduced lead time in the automotive domain? We introduced an architectural decoupling with explicit management of interfaces to support a product line approach with systematic reuse across business units enabling an increase of diversity in these different market segments. This paper describes business, architecture, organization, and process aspects of this approach with special attention to the architecture and the management of interfaces.