Garmin Fishfinder 160 Blue Owner's Manual

Also see for Fishfinder 160 Blue: Specifications Owner's manual

On the Water33On the WaterUnderstanding the ChartWhitelineThe Fishfinder 160 Blue can help you to determine if the bottom ishard or soft. When the sonar soundwaves are reflected back by the bottom,a hard bottom will return a stronger signal than a soft bottom. The strongerthe bottom return, the wider the bottom layer is displayed. The unit usesthe Whiteline function to make this bottom layer information easier todistinguish.When viewing the display without Whiteline active, the bottom returnis black. While you can make some determination of the bottom type,the black return makes this more difficult. With the Whiteline active, thebottom return appears layered in shades of gray and black, which makesdetermining the bottom type easier and more reliable. Example 3 showsthe bottom return with and without the Whiteline activated.Whiteline Turned Off Whiteline ActivatedHardBottomSoftBottomWhitelineWhiteline can also help you to determine the type ofbottom structure that is displayed on the chart. Bydetermining the hardness of the structure you canmake a better informed decision as to the type ofstructure.Structure is hard, probably arock or stumpStructure is soft, probably amud pileExample 3.www.reelschematic.comwww.reelschematic.com