The Humminbird Helix 5 Chirp GPS g3 boast an easily viewed 5" high definition display. The easy-to-operate menu system and keypad are intuitive to use in any condition. The g3 model brings compatibility with dual spectrum chirp, enhancing sonar performance. Includes internal GPS, Humminbird base map, and auto chart live (zero line sd card needed for more than 8 hours of sonar recording). Includes single micro SD card slot, compatible with Humminbird and Navionics charts including lake master, lake master plus, smart strike, coast master (vx), and coast master premium (vx)