Garmin Fishfinder 160C Owner's Manual - Page 23

Beam The Beam setting allows the selection of a Narrow Beam or Wide Beam for the transducer. A narrow beam provides higher detail structure returns of a smaller bottom area. The wide beam shows a larger fish return area with poorer detail of non-bottom structure. Whiteline The Whiteline setting controls how the unit displays information about the bottom type (hard or soft). With Whiteline off, the bottom return displays as a solid color. With Whiteline on, the strongest area of bottom return becomes white and can be used to determine bottom hardness. A hard bottom returns a stronger signal and displays a thicker bottom layer. A soft bottom returns a weaker signal and displays a thinner bottom layer. Operating Instructions > The Setup Menu Hard Bottom Soft Bottom Whiteline On Auto Gain The Auto Gain setting controls the sensitivity of the receiver when in the gain option is set to Auto. Auto Gain has three settings; High, Medium, and Low. Increasing the Auto Gain setting makes the Fishfinder 160C more aggressive when adjusting gain automatically. High auto gain may lead to excessive clutter on the screen. Whiteline Off Fishfinder 160C Owner's Manual 17