Garmin Fishfinder 100 BLUE Owner's Manual

Also see for Fishfinder 100 Blue: Specifications

17Unit OperationNOTE: When the frequency is set to ‘Dual,’ the appearanceof the fish symbols will change. Fish returns from the centerof the beam will be black, but the fish returns from the edgesof the beam will be clear.Whiteline‘Whiteline’ controls how the unit displays information about thebottom type (hard or soft). With the Whiteline ‘OFF’, the bottom returnwill display as black and contain no information on bottom hardness. WithWhiteline ‘ON’, the bottom return will become gray-scaled. The degree ofgray-scale can be used to determine bottom hardness. See page 33 for moredetails on this feature.To change the Whiteline Setting:1. Highlight the ‘Chart’ tab on the Setup Menu.2. Highlight the ‘Whiteline’ selection field and press ENTER.3. Choose ‘On’ or ‘Off’ and press ENTER to accept the selection.Scroll SpeedYou can adjust the speed that the chart scrolls from right to left byusing the ‘Scroll Speed’ selection field. If you are sitting still or the chart ismoving too fast, slowing the scroll rate can be beneficial.To adjust the Scroll Speed:1. Highlight the ‘Chart’ tab on the Setup Menu.2. Highlight the ‘Scroll Speed’ selection field and press ENTER.3. Choose ‘Fast,’ ‘Medium,’ ‘Slow’ or ‘Pause,’ then press ENTER to acceptthe selection.Setup Menu: Chart TabFFish Symbols in Dual Frequency ModeWhiteline Selections