Conrad df 46 portable sonar fish finder conrad df 46 p fed up of picking bad fishing spots and catching nothing this sonar fish finder shows you where the fish are and where it s worth casting p p the sonar fish finder detects fish in water at depths from 0 8m to 24 4m and is suitable for use in both fresh water and salt water the fish formation and depth is displayed graphically on the finder s illuminated easy to read lcd display you can use the fish finder to search for fish in wat