Very cool, congrats! Definitely want to hear a report on the Helix. I think you'll like the Humminbird. I'd like to see a comparison of the 1198 vs Helix 12 vs ION/ONIX 12.
The Onix 12 is about two grand more...so you are not going to be hearing that comparison from me.
There is no ONIX 12. There is the Helix 12. There is the ONIX 8 and ONIX 10.
The ONIX 10 has a higher resolution display than the 1100 series by about 5,000 pixels per square inch.
The Helix 10 and ONIX 10 have about the same screen resolution.
The Helix 12 has a higher screen resolution than the ONIX 10 and Helix 10 by about 3,000 pixels per square inch.
I ran the bow 360 with one of my 1198's in 2014 and then got the ONIX 10 SI NT to run it last year since it has the higher screen resolution. The Helix 12 would be even better and display larger images.
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1