Garmin GPSMAP 585 Plus has combo chart plotter and sonar equipped, 6-inch WVGA color screen and portrait mode display, keyed interface with dedicated button, GPS / GLONASS and BeiDou compatible, create own HD Map, two standard SD card slot, clearest scanning sonar on the water, CHIRP sonar sends a continuous sweep of frequencies ranging from low to high, CHIRP sonar is able to create crisper fish arches with better target separation, multi language support.