The Helix 9 CHIRP GPS gun features a large 9 inch display with LED Backlight and CHIRP 2D digital sonar. Includes GPS Chart plotting with built-in Bluetooth, Ethernet networking capabilities, auto chart live with depth, vegetation and bottom hardness mapping, and unit cover. Features: - broadband CHIRP sonar: exclusive multi-range CHIRP -- view low, mid and high CHIRP ranges, either individually or all at once - 360 Imaging - Hummingbird has you surrounded. 360 Imaging allows you to isolate your sweep, see 5 preset views or see all around you - Switch Fire sonar -- take command of how your sonar returns appear with clear and max modes - Dual Beam plus sonar: two beams combine for great detail and a wide coverage area. Use the narrow beam for high-accuracy returns and bottom. Use the wide beam when you want a larger search area - internal GPS: GPS antenna built into the head unit - up-gradeable software -- access software updates to enhance the performance of your Hummingbird unit through the My Hummingbird section of the site. - dual SD card slots -- use one Slot for advanced cartography and the other to save screenshots, sonar recordings and way points. - high definition display: provides bright, crystal-clear Images for easy viewing in harsh sunlight. - contour XD cartography: contour XD is the built-in base map cartography that covers 3, 000 us lakes with depth contours and many other locations without contours - Ethernet: rig up the ultimate fishing system. Use the 5-port Ethernet switch to link together multiple Hummingbird head units or share transducers - i-pilot link is an integrated GPS trolling system available on select Minn Kota Ulterra, terrorism and PowerDrive V2 motors which enable your motor and Hummingbird to communicate.