The HELIX 7 CHIRP MEGA DI GPS G4N fish finder features MEGA Down Imaging, Dual Spectrum CHIRP Sonar, AutoChart Live, Internal GPS and Humminbird Basemap built-in. An upgraded high-definition 7″ display will give you the best view of the many pre-loaded split screen view options so that you’ll never miss a fish. All HELIX 7 G4N models support Ethernet networking, Bluetooth(R), NMEA 2000(R), and are compatible with the One-Boat Network(TM), which means you’ll have total control of your fishing machine at your fingertips. Features: MEGA Live Imaging, Networking, Down Imaging, Built In GPS, Bluetooth, Dual Spectrum CHIRP, Built In Mapping, MEGA Imaging. Memory Card Slot: Dual Micro SD. Sonar-Standard: Dual Spectrum CHIRP, MEGA Down Imaging. Sonar-Coverage: 20°, 42°, 60° & (2) 86° @ -10dB. Sonar-Frequencies Supported: 50/83/200/455/800 kHz, HW DSC CHIRP, and MEGA. Depth-Sonar: 3,500 ft. (optional 50 kHz), 1,200 ft. (standard transducer). CHIRP – Imaging Frequencies Supported: 455 kHz (440-500 kHz), MEGA DI (1075-1150 kHz). Depth-Down Imaging: 350 ft (455 kHz), 125 ft (MEGA). Interface: Keypad Control. Transducer Included: XNT 9 HW MDI 75 T.