Our boat came with a glue-in Hawk eye Depth finder. I have yet to see it display anything but " - - - ". I have been doing a lot reading on the web and in their manual to troubleshoot. Specifically in their manual it says that a "really soft bottom" could be an issue. It was also mentioned to me that in the Pamlico River and sound that depth finders have issues with accuracy and to pay attention to my charts. Can anyone corroborate that mudddy/sandy bottoms are an issue with this type of transducer before I decide to troubleshoot and re-install it? I get the physics of sonar and that a soft target may cause issues, but I am still new and I guess I just assumed that since sandy bottoms are the best type of anchorage locations, this wouldn't be an issue for a typical depth finder.