My dad gave me an Eagle silent sixty WP locater for my boat. He called it a (spinner or rotator or something like that). It has no graph type readout. I know how to adjust it in and read bottom levels. My dad explained to me that you can tell by the way the orange bar looks if the bottom is mud or rock or seaweed. he also said you can see structure and fish on it. I cant see anything but a solid bar that goes up and down in level. I don't have the manual for this but if anyone knows the trick to reading this please let me know. I know it's not really a "fish" finder but i would like to be able to read structure with it.