Fishfinder 400C A-scope, split-screen zoom, color display, 240 x 320 pixels, adjustable depth line, bottom lock, Ultrascroll, Auto Gain. The versatile Fishfinder 400C has a super bright, high resolution 4-inch display and is great for finding fish in both freshwater and saltwater. The 400C is available with a choice of dual beam or dual frequency transducers, so it's readily adaptable for both freshwater and saltwater fishing.