Ever seen electronic devices on the boat to help locate fish? That tool is called a fish finder; an electronic device that locates fish in the vicinity like a global positioning system (GPS) locates places. Why are portable fish finders so valuable? They can determine whether or not the fish could bite in the vicinity an angler is fishing at. Fishing at the dock, lakes, and bays can require patience to determine if fish will bite because sometimes fish are just not in the area despite using good fishing technique and bait. A portable fish finder also can determine the size of the fish that is displayed on the fish finder screen.