The HB manual link seems to be unavailable to my iPhone right now ...
Go to this link and click the HELIX manual link:
https://www.humminbird.com/support/m...568173842#fish
-----
-----
It seems to me the newer manuals are not as detailed as the older numbered series core unit manuals (I still research in my old 1197 manual for better detail on individual settings - even tho newer added feature settings of HELIX are not included in the 1197 manual) ...
I would be glad to send you the 1197 manual in a zip file if you will PM me your email address ...
Rickie