16 Fishfinder 160C Owner’s ManualOPERATING INSTRUCTIONS > THE SETUP MENUBackgroundThis setting allows the Background color tobe changed. The available settings are: Black,Blue, and White.NumbersKeel OffsetThe Keel Offset setting allows the user to offset thesurface reading for the depth of a keel. This makesit possible to measure depth from the bottomof your keel instead of from the transducer’slocation. Enter a positive number to offset for akeel. It is also possible to enter a negative numberto compensate for a large vessel that may drawseveral feet of water.SizeDetermines the size of the depth, battery,temperature, speed, and distance numbersdisplayed on the screen, either Small or Large(default).BatteryChoose to either Hide (default) or Show thecurrent battery voltage.Water TempWater Temperature automaticallyappears when set to Auto (default),or you may choose to Hide the WaterTemperature.SpeedSpeed automatically appears when set to Auto(default), or you may choose to Hide theSpeed.DistanceDistance automatically appears when set toAuto, or you may choose to Hide (default)the Distance.Transducer at SurfaceEnter (+) positivenumber to show depthfrom the bottom of keel.Transducer at Bottomof KeelEnter (-) negative number toshow depth from the surface.