HDS 7 Question

I have a hds 7 took it out for the first time yesterday. While using the sonar and going around 20mph or so the screen was showing like tiny bubbles(dots) over the whole screen, top to almost the bottom of screen. Is this something simple to fix or would it be the transducer? Thanks for your help.

check all of your electrical connections 1st.

Next time it happens, take a snapshot and post it...

Bubbles can be created by your placement of transducer off the back. Lower the transducer if you have adjustments.