
Humminbird HELIX 12 CHIRP MEGA SI+ G4N GPS/Fishfinder
Intuitive, powerful, and built for serious anglers.
The HELIX 12 G4N combines cutting-edge sonar technologies, smart networking, and user-friendly controls to help you find and catch more fish. Featuring a brilliant 12.1" display, MEGA Side Imaging+, MEGA Down Imaging+, Dual Spectrum CHIRP sonar, and internal GPS with Humminbird Basemap.
Top Features
- Keypad Control
Navigate effortlessly using soft key controls and a user-friendly menu. - MEGA Side Imaging+
See up to 200ft on either side of your boat with 20% more detail and 60% more range than standard Side Imaging. - MEGA Down Imaging+
Exceptional underwater clarity to 200ft below your boat with 20% more detail and depth range. - Dual Spectrum CHIRP Sonar
Get highly detailed fish arches and bottom structure with Wide and Narrow search modes. - Built-in GPS & Humminbird Basemap
View terrain, buoys, marinas, hazards, and more with enhanced base mapping. - AutoChart Live
Create real-time maps of depth contours, bottom hardness, and vegetation with 8 hours of built-in recording. - One-Boat Network Compatible
Seamlessly integrates with Minn Kota and Cannon systems for full-boat control. - Networking Ready
Includes Wi-Fi, Bluetooth, Ethernet, and NMEA 2000 for smart connectivity and expansion.
Included in the Box
- Control head
- Transom mount transducer
- Mounting hardware
- Power cable
- Gimbal mounting bracket
Specifications
- Display 12.1" (1280H x 800V)
- Sonar Dual Spectrum CHIRP, MEGA SI+, MEGA DI+
- Depth Range Up to 1200ft (standard) / 3500ft (optional 50kHz)
- Side Imaging Range Up to 800ft (455kHz) / 400ft (MEGA)
- Down Imaging Depth 200ft (MEGA), 400ft (455kHz)
- Power 10.8–20 VDC, 1000W RMS
- Mount Gimbal
- Connectivity Dual SD card slots, Ethernet, Bluetooth, Wi-Fi, NMEA 2000
- Networking One-Boat Network, Minn Kota, Cannon, AutoPilot, AIS, Radar
- Memory AutoChart Live (8 hrs built-in), chart card sold separately
Compatible With
- LakeMaster, CoastMaster, Navionics (Gold/Platinum+)
- Minn Kota i-Pilot Link, Talon, Raptor
- MEGA 360 Imaging, CHIRP Radar
- NMEA 2000 devices
- Humminbird FishSmart App (for updates and notifications)
Warranty
- 2-Year Limited Warranty
Note: Chart card sold separately.
Smart VIP Price Promise
Our prices are very Smart at Smart Marine! Our Smart VIP Membership and committment to great deals makes sure of that, but if you find a lower price, tell us- we will match it!*

Price Promise Terms & Conditions
- Excludes limited time specials, clearances, non-stocked products, overseas websites, price comparison websites and eBay/TradeMe.
- Applies to identical products, in stock in NZ with pricing valid at time of price match request and purchase, with evidence supplied.
- Excluded Products: clearance, run-out, distress, damaged/soiled, parallel imported, non-stocks, trade quotes, commercial quantities, credit account holders, insurance claims, services, typos, overseas websites, price comparison websites, auction websites.
- Free product, offers, sales and promotions cannot be redeemed with price matches.
- The price match applies to the total cost to buy including shipping, taxes and fees.
- Approved Price Promise Matches and purchases can only be redeemed with our store crew. Please contact your closest store with stock.
- Short term finance may not be available with some price matched purchases. Please enquire.
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