Garmin echoMAP 50s GPS with Transom Motor Mount Transducer, Worldwide Basemap and US BlueChart g2 Offshore Charts Combination 10Hz high-sensitivity GPS chartplotter and sounder with our exclusive Garmin HD-ID target tracking technology Built-in satellite receiver for highly accurate position, velocity and time data 10 times a second. Offers true position and heading data smoothly and accurately -especially evident when coming out of turns Supports multiple Global Navigation Satellite Systems -including GPS, GLONASS, Galileo2, QZSS2 Dual microSD card slots for optional mapping and/or user data. Please Note: echoMAP series is not compatible with BlueChart g2 Vision Multiple mounting options -new bail mount and flush mount designs with cable management or choose our all-new exclusive flat mount option