1kw mega down-imaging sonar, Shop Humminbird Helix 9 CHIRP MDI+ GPS G3N, w/Xdcr: Sports & Outdoors, nmea 2000, optional radar, optional navionics, bluetooth, With transom mount transducer, ethernet, internal gps, Free delivery and returns on all eligible orders. w/Xdcr, Humminbird Helix 9 CHIRP MDI+ GPS G3N. basemap, 30 imaging, " lcd, ais, mfg .... Search: Humminbird Helix Mega Settings. About Humminbird Settings Mega Helix . 23 shipping. I spent the better part of two weeks, doing tons of graphing with this new Lowrance 9Ti, and spent some time in a buddies boat with a Gen 2 Helix 12 with Mega Imaging, just to try and make a comparison of Lowrance Elite Ti to the Humminbird Helix and compare Lowrance Structure..