Stankypete757 : Fishing Forum Posts

Hi all, new to the BU and really excited I stumbled across this place. I have a quick question that has been driving me crazy. I finally upgraded to side imaging and I feel like I had a good grasp on how to interpret the bright/hard returns and shadows offshore but I'm lost on interpreting anything along shorelines. If I'm set at 60ft out the side for example but only 20ft from the shoreline, why/what/how am I able to see any returns past 20ft? I thought that represented a decline or grass?