Garmin Car Adapter for GPS Garmin Vehicle DC Power Adapter for GPS StreetPilot. Garmin is a leader in Global Positioning System (GPS) technology and an innovator in consumer electronics. It serves both the aviation and consumer markets. Its products are used in flying, boating, driving, hiking, and many other activities. Garmin is customer focused and committed to producing quality products that improve people's everyday lives. This connector provides the power connection for your Garmin GPS device from the 12 V DC car cigarette lighter output.