Fished with a partner recently who had just purchased a Helix 10 mega. I was looking forward to seeing the upgraded imaging on Si/Di but what really blew me away was the sonar. We were very clearly marking groups of fish that his older Lowrance and Standard Helix 7 showed only vague globs that were undistinguishable.

 

Anyone know what changed 2D sonar wise on these new units? I wanted a mega for the SI but the difference in sonar blew me away

How "new" is the unit? In the last year Humminbird has released an upgraded HW (High-wide) with a "Low-Q
 transducer. The technicalities of how the hardware and function compares to other brands, I do not know. However, this is the 2D sonar technology that Humminbird claims produces the best returns. I have it on 2 of my units and I think it is fantastic.

They added chirp 2D sonar to the latest generation of Helix and Solix units which gives them higher resolution returns.  

1 hour ago, Dirtyeggroll said:

How "new" is the unit?

I couldnt say exactly but I believe his "older Helix is a G2. Maybe 2 years old.

 

58 minutes ago, Tennessee Boy said:

They added chirp 2D sonar to the latest generation of Helix and Solix units which gives them higher resolution returns.  

I am almost positive both the standard 7 and 10 mega are chirp sonar

Early sonar units before Chirp were single frequency, multi frequency units with Chirp display better target separation and details. Electronics are constantly improving.

Tom

15 minutes ago, riverbasser said:

I am almost positive both the standard 7 and 10 mega are chirp sonar

Yes,  the older models did have CHIRP. The latest generation introduced dual spectrum CHIRP in 2D sonar. 

 

https://www.humminbird.com/learn/sonar/dual-spectrum-CHIRP?_ga=2.257626635.1037008152.1583243369-343789696.1538052727

Maybe the biggest thing is the increased resolution on the newer units.  CHIRP is great and helps but the pixel count on the two older units is nothing compared to that newer Helix 10 Mega.