Box AA. The Graph Paper Fish Finder Lowrance is a system with a transducer designed for fishing enthusiasts. It features chart plotting capabilities and sonar sensors for accurately locating fish in both indoor and outdoor environments. Made from a combination of paper and plastic, this fish finder is durable and designed for maximum depth readings. With preloaded courses and a clear display resolution, the Lowrance fish finder is a reliable tool for anglers looking to enhance their fishing experience.