Humminbird HELIX 12 CHIRP MEGA SI+ GPS G4N Review

Humminbird Helix 12 Mega Si+ Gps G4N is a massive fish finder around 12inch designed for people who prefer large fish finders over smaller ones.

Mega Si+ Gps G4N Overview

This model is much bigger, and you can view a lot of sophisticated images. Helix 12 proves to be the best resolution and beats other models of Humminbird.

Humminbird HELIX 12 Review

Brand: Humminbird | Model: Helix 12 | Our Score: 8.6/10

Helix 12 Mega Si+ Gps G4N will cover all the features that will provide you an excellent fishing trip. There are several sophisticated fish finders designed and manufactured by Humminbird where you can access MEGA imagine, GPS, premium charts, Ether port, and Helix 12 is one of them.

Also Check: Humminbird Helix 10 Chirp MEGA SI+ GPS G4N Review

Humminbird Helix 12 Pros & Cons


  • Easy to use
  • Easily switch between options and start locating a fish
  • Much larger compared to other models
  • Versatile features of CHIRP sonar, accurate GPS, down imaging, side imaging.
  • Doesn’t waste your time in figuring buttons, reading manuals, and coordinating the option.


  • Expensive: This model is expensive and pricey compared to other models and brands because of its size and versatile features.

Humminbird Helix 12 Mega Si+ Gps G4N Specs

SpecificationsHumminbird Helix 12
Display Size – Diagonal12.1″
Display Resolution1280H x 800V
Power Input10-20 VDC
Power Output1,000W RMS
Transducer IncludedXM 9 HW MSI T
Wifi AvailabilityYes
MappingHumminbird Basemap
Frequencies50/83/200/455/800 kHz & 1.2 MHz
Sonar CompatibilityDual Spectrum CHIRP, MEGA Down Imaging+, MEGA Side Imaging+
Sonar Depth1,200 ft with standard transducer
Depth-Down Imaging125 ft (800 kHz), 200 ft (MEGA), 400 ft (455 kHz)
Warranty2 Year Limited

Humminbird Helix 12 Features

Auto Live Features

Humminbird designed this model with excellent and sophisticated features that are packed with power. People prefer this model, not only for its huge screen and big sir but also its additional features and benefits.

One important criterion is that hummingbird makes the model of fish finders quite simple to make navigation easy.

Mega Side Imaging

Mega imaging includes both mega sides imaging and mega down imaging. G4N variants with Mega imaging give you the best imaging version, and you can easily view 125 feet around your boat. This model comes with 360-degree imaging and gives the clearest reading and updates quickly. New monitoring areas, locating fish around the radius, and getting their photographic results.


This model allows you to view things easily as it is super bright and had 1500 nits. It has 1280 by 800 HD pixel crystal resolution. This helps to remove glare and view at all the angles more accurately.

Sonar Readings

The display ensures easy viewing of sonar readings at any time of the day. Due to its brightness and crystal-clear resolution, sonar readings can be viewed during the morning, afternoon, or pitch dark night.

360degree Imaging

One important feature of the Helix 12 model is 360-degree imaging, ensuring clear readings around the vessel. With mega 360 imaging, you can easily monitor fish and other structures under the water and get the photographic outputs that enter and exit the radius.

Dual Spectrum CHIRP Feature

Helix 12 has a dual spectrum chirp feature that offers you three modes to choose from. It may sound that the number of the modes is only two, but there are three, and you can easily choose your mode from the options. If you want to take larger images, then the wide mode is a good option.

This mode casts signals between 140-200 kHz. You can expect the image quality to suffer from the wide radius. You can switch after finding your target to the Narrow mode. This mode casts a signal between 100-240 kHz. Here you can expect a good image quality, but the size may reduce.

Between the normal and wide modes, you can find another mode called full mode, which combines both qualities and mixes the best quality of both the modes. This model casts a signal between 150-220 kHz. Here you get a good quality image and size and is big too.

Side Imaging

All the modes of Humminbird have features of side imaging. It has brought a new model, which is an upgrade version of premium MEGA side imaging without the positive signs and the regular side imaging. It is now Mega side imaging +

The feature of this imaging type is that you can see both the right and the left directions simultaneously. The sides of the vessel receive the beams due to this imaging type.

Mega side imaging + is far better than the previous mega side imaging since it uses high frequency compared to other frequencies, which is shorter. It gives 20% clearer views and 60% better distance than the regular or previous side imaging.

You have three options to choose frequencies:

  1. 800feet with 455 kHz
  2. 400 feet with Mega
  3. 250 feet with 800kHz

Mega Down Imaging

Humminbird has come up with a new side imaging called Mega down imaging+

Check the model to ensure that you are getting mega down imaging + and not any other type. Helix 12 Mega Si+ Gps G4N has the feature of down imaging which helps you view under the boat and locate the exact position of the fish.

This imaging type does not have a similar distance to the side CHIRP imaging but is known for its clarity.

You can select different frequencies:

  1. 200 feet with mega
  2. 125 feet with 800 kHz
  3. 400 feet at 566kHz


This model connects with the Humminbird Base map, which helps you access US lakes (more than 10000) with an overall coverage of coastal regions. It includes contours, day markers, depth markers, buoys, and other pointers of interest. Along with the Base map, you get features of premium charts for a fee.

These upgraded premium charts give vast details about Lake Master, Navigation Coast Master, Navionics. This fishing areas can easily be spotted in your area because of ample details. Now you can mark hundreds of waypoints (around 2500) along your trip.

Auto Chart Live Feature

This model has developed an important upgrade called Auto chart Live which connects you to Lake Master. With the Auto chart live option, you can keep track of fish, contours, vegetation, and bottom hardness. You can record data and other changes that take place.

Bottom Line

Helix 12 Mega Si+ Gps G4N will serve you appropriately if you want big fish finders and are tired of smaller ones. This model is packed with Mega imaging, power, clarity, and good image quality. Because of their tremendous feature, it has become the best option among all other Humminbird models and other brands.

The 12inch screen helps you to see all imaging types. If you want a fish finger with lots of features, then Humminbird Helix 12 is exactly what you need. This model is considered to be the best from all angles.

About Me

Patrick Burrell  

Hey there, Patrick here. The Guy behind this blog.

My first fishing experience started when I was 11 years old, fishing for breams in my local lake at home.

In the years following, the hobby turned almost into a full-time pursuit, often requiring the travel of the country to discover new fishing grounds. I enjoy catching pike and king salmon the most. 

I have started this blog to share my experience and knowledge about fishing and fishing equipment.

I hope you enjoy my blogs. Wish you good reading..

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