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Humminbird Helix 7 Reviews [Comparison of Models DI & SI]

Fish finders are all about technology these days. You no longer have to guess where the fish are based on weather, but you can use technology to be 100% sure. If this is your first purchase, you are definitely going to be a bit confused by all those terms such as transducers, sonars and flashers etc, yet some products do stand up in the crowd.

Your search will take time, but you will inevitably run into a plethora of Humminbird Helix 7 reviews. Why? Easy – these are the best rated products on the market. The real question is – which one is better and why? Here is a quick comparison of the 2 most popular types, The DI and the SI.

Humminbird helix 7 reviews

Humminbird Helix 7 Chirp MDI GPS G3

  • 800 x 480, 7-Inch Color WVGA display with backlight
  • Depth-Sonar: 1,200 ft (standard transducer)
  • MicroSD card slot
  • Sonar: Dual Spectrum CHIRP, MEGA Down Imaging
  • Depth-Down Imaging: 350 ft (455 kHz)
  • Transducer: XNT 9 HW MDI 75 T

Humminbird Helix 7 Chirp MSI GPS G3

  • 800 x 480, 7-Inch Color WVGA display with backlight
  • Depth-Sonar: 1,200 ft (standard transducer)
  • MicroSD card slot
  • Sonar: Dual Spectrum CHIRP, MEGA Down Imaging, MEGA Side Imaging
  • Depth-Down Imaging: 480 ft (455 kHz)
  • Side Imaging: 480 ft (455 kHz)
  • Transducer: XNT 9 HW MSI 150 T

General Overview of the Humminbird Helix 7

Humminbird has gained notoriety due to its innovative features. It aims to combine classic fish finding with modernist technologies for more accurate results. 

At a first glance, they might look similar in tech specs due to a series of shared features. But as you go deeper, you will soon understand what makes the difference.

1. Humminbird Helix 7 Chirp MDI/GPS G3


The GPS mode is quite accurate and instant due to the chart plotter design. It is enriched with MSAS, EGNOS and WAAS technologies. As a result, it can provide efficient results within 8.2 feet.

At the same time, it will provide details that any other GPS will, such as the speed of your boat. You can store newly discovered routes – up to 45, as well as 50 tracks. There are over 20,000 points checked on each track.

The patented UniMap package covers rivers, lakes and the coastline. The GPS is compatible with systems like Navionics Platinum+ or LakeMaster PLUS, among a few others. The SmartStrike compatibility is not to be overlooked either.


Safety is critical when sailing. The drift alarm feature allows you to determine a particular perimeter once you anchor the boat. If it somehow drifts out of the boundaries, the alarm will notify you.

The off course alarm is similar and notifies you when you miss the setup course. The Bird's Eye View setting allows a deeper understanding of your surroundings, as you can get a 3D view of the area.


According to pretty much any Humminbird Helix 7 Chirp MDI G3 Fishfinder review, the transducer on this unit has not been upgraded from the fifth generation due to its superior capabilities. It carries the XNT 9 MDI 75 T features, so it makes no difference what temperature the water is. The cable measures 20 feet, so it can go quite deeply.

The sonar covers three frequencies – 455/800 on Down Imaging, 200/455kHz on 2D and 200/455/800kHz. The pulse is easy to modulate on more frequencies, so the imaging is accurate and clear. Forget about clutter too.


Despite not being the most impressive system on the market in terms of depth, every Helix 7 Chirp MDI GPS G3 review will claim on good results if you follow the instructions. It can go down to 350 feet for Down Imaging and 600 feet for 2D. A more detailed comparison of side and down imaging is covered here.

For maximum accuracy, keep the speed at 1-6MPH.


The control panel is quite intuitive and straightforward. If you have used other similar systems, you should have no problems with this model.

It is available on a 7 inch display with LED backlighting and a classic 800x480 resolution. Getting used to it is a matter of minutes.


Connectivity is general – nothing special, nothing bad.

Since you mostly use it on water, the system is IPX7 waterproof. According to most reviews,  it will get the job done. You have no Ethernet connectivity, so no upgrade can be conducted online. However, you have a microSD card reader, as well as a solid NMEA 0183 port.

In other words, this is how you do all the chart upgrades or data transfers. Sonar recordings follow the same procedures. A mount is available in the package, although you can also invest in a different mounting kit in the dash.

The Pros and Cons


  • Plenty of sonar functions, including Selective Fish ID+, RTS and others
  • Highly accurate GPS due to various enhancements
  • Able to map or remap bodies of water through AutoChart Live
  • Gimbal mount and compatibility with other mounting systems
  • Ideal for in land fishing due to the depth ability


  • No side imaging feature

2. Humminbird Helix 7 Chirp MSI/GPS G3


The MSI/GPS version of Helix 7 Chirp GPS G3 comes with an innovative 3-in-1 sonar. Basically, you have three different options – Down Imaging, Side Imaging and DualBeam Plus. No matter which option you choose, you benefit from the Chirp technology. Simply put, the pulse goes over multiple frequencies and not just one.

Separating targets is more efficiently done. Clutter is also reduced, while the display will clearly show a difference between actual fish and random structures. In general, this fish finder is simple to read.


According to the manufacturer, this system can go down to 480 feet for SI and DI. It is worth noting that a 50/200kHz deepwater transducer will turn the fish finder into an industrial model, with depth abilities going down to 2,500 feet in 2D. Unless you run an expert business, chances are it is more than enough for regular fishing.


The transducer available on the Humminbird Helix 7 Chirp MSI/GPS G3 carries the XNT 9 SI 150 T quality features. Furthermore, it features a transom mount. The cable measures 20 feet and temperature is less likely to affect your results. There is a sensor integrated into the transducer.

Just like you have probably guessed already, the transducer will support the Chirp sonar with no problems at all.


Navigation is one of the main considerations in this model due to the AutoChart Live capability. You can map and remap particular bodies of water as you sail.

On a side note, you will need a card to use the feature – ZeroLines, Navionics or LakeMaster. You will, however, gain some extra options in the menu once you get a card. The drive can stock around 8 hours of mapping. Those who need more information can always purchase a card.

UniMap charts are preloaded. They may not be the most detailed options, but they do cover lakes, rivers and the coastline. They will keep you safe and supply enough information for an efficient navigation. The GPS receiver is internal and enhanced with MSAS, EGNOS and WAAS technologies. It will store 50 tracks, 45 routes and 2,500 way points. It will also display your speed as you sail.


Most Humminbird Helix units share a series of features. Many of them have something to do with the sonar and this one makes no exception either. Some of the most significant settings include sonar recording, SwitchFire, screen snapshot, Selective Fish ID+, split zoom, Real Time Sonar or bottom lock.

Fish alarms are quite handy if you are not paying too much attention. The unit will ring an alarm whenever it detects good amounts of fish underwater. Other alarms let you know when you lose track of your selected route or you exit a preset perimeter for your anchored boat. 

> For more alternatives of fish finders, check out our reviews <

The Pros and Cons


  • Powerful transducer with temperature capabilities
  • Impressive depth capability, especially when upgraded
  • Plenty of sonar features for more efficient results
  • Highly precise GPS due to WAAS, ENGONS and MSAS enhancements
  • Intuitive LED control panel with IPX7 waterproof capabilities and a classic 800x480 resolution


  • None


Humminbird Helix 7 Chirp MDI GPS G3

Humminbird Helix 7 Chirp MSI/GPS G3

Our Rating
Our Rating

Our final verdict is, the MSI model is a bit better due to it being able to scan deeper than the MDI model and also the presence of its side imaging features together with a more advanced transducer. It does costs a little more but it is well worth the price.

Adam Parsons

Hi! I'm Adam Parsons - a fishing enthusiast. I have been fishing for more than 15 years now and I still strongly remember that the toughest part for me was during the learning process. Most guides I read during that time was too technical to understand. Therefore, I make sure that everything I post on dream-guides regarding fishing is written well and easy to understand even if you are a newbie.

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