Fish finders are apparatus used to seek and catch fish, and their important in locating specific aqua creatures under water. Fish finders gives the fisherman the options of viewing the depth, aqua structure, fish hiding locations, speed and also depth temperature. The display comes in black or colored screen and incorporates sonar signals. These signals locate and give back visual images of both still and moving objects below the water surface. A transducer converts electrical impulses from the fish finder to sound signals. These waves travel down through the depth of the water to the bottom surface or on a fish and the return echoes which are picked up by the fish finder transducer, which in turn converts it to electric impulses. These electric impulses are the ones that are sent back to the fish finder where they get converted into a symbols or a pictures.