I agree the Sonar hub does it all...StructureScan HD and 2d CHIRP...

But I'm still thinkng the StructureScan HD in the Sonar Hub is the same tone pulse StructureScan HD sounder that's already in the Touch units and in the LSS 2 module...not SI/DI CHIRP...

http://www.lowrance.com/en-US/Produc...ule-en-us.aspx

So my understanding is the Sonar Hub can replace the LSS 2 module on Gen 2 (nonTouch) models ...and add 2d CHIRP...

And on the Touch units...it just adds CHIRP to the 2d ...

(I could be mis-reading the specs)...

Rickie