Downscan and bass school

[Carrington]

for hummingbird the si is internal so from my understanding, you could not add it at a later date.  Lowrance the structure scan is external which means you can add it to units that are capable of receiving it.

[Wayne P.]

Carrington is correct. Only a Humminbird SI unit can be SI/DI

[scrutch]

Awesome screen shot

What we need (hint hint) is someone to do a thread like I did on fishing Toledo Bend but about reading depth finders, side imaging, & downscan.

Question out of curiosity, Rayburn?

Or, my I add, someone to do a Catt-style thread "seminar" on fishing Kentucky lake in, say, April, like the 17th to the 22nd...pickin' up what I'm puttin' down?

Great pic by the way. can't wait till soft water returns.