Is the digital depth jumping around or stable..??

Are you using 200kHz or 200/83kHz...??

Is "Switchfire" on "Clear" or "Max" mode...??

What is the sonar sensitivity set at...??

Does the DI show a good bottom return...??

Turn on the "RTS" window to "Narrow" and see if it shows a good return at the bottom depth..(RTS is Real Time Sonar which is a vertical flasher with no filtering)...

Rickie