Find fish and navigate underwater hazards with the help of the Humminbird Helix 15 CHIRP Mega SI+ GPS G4N CHO Chartplotter. Dual Spectrum CHIRP sonar combines with MEGA Side and Down Imaging+ for crisp, detailed imagery that lets you select a wide or narrow view. The internal GPS and basemap offer enhanced navigation and over 10,000 charts. An LCD display and soft keypad allow easy viewing and operation in all conditions.