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***Tom - Raymarine - Moderator***

Hello Captain Starbucks,

Since you don't seem to have had any answers to your question, I'll see if I can help (I'm in Australia so don't know the boat/location.)

For a sounder to perform well it needs a good 'signal-to-noise ratio', that is a loud echo signal relative to the background noise level. Poor performance results when the signal is weak or the background noise is strong (loud.)

I've put a lot of background info and some diagnostic test information on this page. I'd suggest having a read through this, taking some diagnostic images as I describe there, and then posting them back here so that I can have a look and see whether you have weak signal, high noise or a combination of the two. Then we'll be able to look at how to tackle the problem.

Tom