microSD™/SD™ card: VUS021R-California-MexicoPremier Coastal Charts Provides exceptional coverage, clarity and detail with coastal charts that feature integrated Garmin and Navionics data Auto Guidance technology calculates a route using your desired depth and overhead clearance and provides a suggested path to follow Certain areas offer high resolution relief shading, which combines color and shadow to give you an easy to interpret, clearer view of bottom structure Includes depth range shading