I use my iPhone exclusively as gps. Numerous head units will sync with Realize its not droid but it works the same. It syncs with the phone to display And read gps directions...I use motionx with my pioneer unit, seamless and cheap.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth