Humminbird's premium push-button driven combo includesMEGA Side Imaging, MEGA Down Imaging, CHIRP Digital Sonar and traditional DualBeam PLUS sonar.The HELIX 12 CHIRP MEGA SI GPS G2N features a large 12.1" diagonal display with LED backlight, CHIRP MEGA Side Imaging, MEGA Down Imaging and 2D sonar. Includes GPS chartplotting, built-in Bluetooth, Ethernet networking capabilities, AutoChart Live with depth, vegetation and bottom hardness mapping.MEGA Side Imaging: MEGA Imaging has you covered from multiple angles. Choose MEGA Side Imaging for an incredible view to the left and right of your boatMEGA Down Imaging: MEGA Imaging has you covered from multiple angles. Choose MEGA Down Imaging for a crystal clear picture below your boatContourXD Mapping: Humminbird ContourXD is an enhanced, professional mapping package with over 3,000 U.S. lake maps in the database. ContourXD maps feature depth contour lines, so you can find all the drops, bumps and channels holding fish. The maps also include U.S. lights/markers, and major roads and interstates.Key Features455kHz Side Imaging provides 800' of side to side coverage455kHz Down Imaging works to a depth of 400'1.2 MHz Side Imaging provides 250' of side to side coverage1.2 MHz Down Imaging works to a depth of 125'SpecificationsDisplay Type: Color TFT, LED backlitScreen Size: 12.1" diagonalScreen Resolution:1280 x 800Included Cartography: ContourXD inland cartographyOptional Cartography: Navionics (NAV+ Platinum+), Humminbird MappingData Interface: NMEA 2000 (optional), i-Pilot Link (optional), NMEA 0183Receiver Type: Internal 10Hz GPSSonar: MEGA Side Imaging, MEGA Down Imaging, CHIRP Digital Sonar, DualBeam PLUSTransmit Power: 1kW (RMS)Frequency: 83/200/455/800kHz and 1.2MHzBeamwidth: 20, 60 and (2) 86 and (2) 55 at -10db (Total of 180)Max. Depth: 125'(DI) 400'(DI-455kHz) 1500', 3500'Transducers: XM 9 20 MSI T Transom mount includedDimensions: 14