TP : Fishing Forum Posts

Hey GDP,
Helix 7, MSI, transom mounted transducer. Depth stops reading around 16mph no matter what mode I'm in, (2D, down, etc;). It's been adjusted 6 ways to Sunday, but can't seem to get it going.
I've installed many units and never had this issue. Do the side imaging transducers not read depth above idle speed?