I purchased my first boat about a month and half ago and it came with 2 fish finders: on the trolling motor it has a humminbird wide eye and on the back of the boat it has a 400TX. Anyone have any opinions on either or both of these?

neither have helped me locate any fish really. I mean they show fish occasionaly, but they honestly have not helped me catch any. So i am wondering if I need to replace them or am i expecting too much?