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Garmin GPSMAP 421S Marine Chartplotter, Brand New. The GPSMAP 421S is a compact chartplotter that features an ultra-bright 4"QVGA color display along with an improved high-speed digital design for increased map drawing and panning speeds. Its ready to go with a built-in, satellite-enhanced worldwide basemap and an easy-to-use interface designed to help you navigate the open waters with ease. The GPSMAP 421S also accepts BlueChart® g2 Vision cards for added features and functionality such as high-resolution satellite imagery, 3D views and Auto Guidance technology. View Satellite-enhanced Worldwide Basemap. The GPSMAP 421S basemap contains worldwide satellite images in place of traditional maps. The GPSMAP 421S also comes standard with a high-sensitivity GPS receiver for superior satellite tracking and quicker acquisition times. In addition, the GPSMAP 421S can receive U.S. graphical weather data via optional GXM 51 satellite receiver/antenna. And with an SD card slot, its easy to add additional maps without connecting to a computer. The GPSMAP 421S, comes with a powerful dual-frequency transducer that clearly illustrates depth contours, fish targets and structures whether youre fishing in freshwater or off the coast. Add Extras with BlueChart g2 Vision With the optional BlueChart g2 Vision SD card, you can add a whole new dimension of exceptional features to your chartplotter. 3D Mariners and Fish Eye view provides you with a 3-dimensional perspective of map information, both above and below the waterline. High-resolution satellite images and aerial photographs help you orient yourself in unfamiliar areas. Auto Guidance technology searches through all relevant charts to create a route you can actually follow.