I have the same sounder as you and I don’t get the arches either, but as above I do look for haystacks on the bottom, I think to get the arches you would need to be anchored up, zoomed in, bottom locked and have no bottom clatter to see individual fish and they would have to be big specimens.

There are really good vids on YouTube that show you how to use sounder’s properly and I’ve found the Garmin guys at the boat show really good as well.

I only drift fish so I just use the standard settings work fine for me.

I have a similar model Garmin 9 inch echomap ( might be the same? ) mines 3 years old too.

Troutzilla wrote: I have a similar model Garmin 9 inch echomap ( might be the same? ) mines 3 years old too. I get pretty good readings on mine although I don't fish really deep, mostly 50 metres or less. I don't have many pics but heres a recent one in 23m of a snapper haystack on the bottom, you can actually see one of our lines off to the right and  I'd say that's the softbait or jig being lifted and dropped back far right near the bottom.

Very nice pick, I see you’ve got your gain on auto do you run your other sounder Settings on auto.

I purchased the book 'How to Use an Echo Sounder / Fish Finder' by John Adams some years ago.  It's a good read.

And Im wondering if I should set the angle to maximum ?