GP1670F_1870F Operator's Manual - Furuno USA

7.6 Manual Fish Finder Operation7. FISH FINDER OPERATIONSUse the manual operation to see schools of fish and the bottom echo with a fixed gainsetting.The gain, range and range shift functions let you select the depth you can see on thescreen. The basic range provides a "window" into the water column and range shiftmoves the" window" to the depth that you select.To select the manual mode, open the RotoKey menu then select [Auto Mode] and[Manual].7.6.1 How to select a display rangeRange can be selected automatically or manually. Open the RotoKey menu then select[Auto Range] and [Auto] or [Manual].[Auto]: The range is automatically adjusted to always display the bottom echo at thelower of the screen. When rotate the RotoKey TM in the auto mode, the message “AutoRange mode. Can’t change Rage.” appears.[Manual]: Change the range with the RotoKey TM . Turn the key clockwise to increasethe range and counterclockwise to decrease the range.UnitBasic Range1 2 3 4 5 6 7 8m 5 10 20 40 80 150 300 500ft 15 30 60 120 200 400 1000 1500fm 3 5 10 20 40 80 150 300HR 3 8 15 30 50 100 200 300pb 3 5 10 30 50 100 200 300HR=Hiro (Japanese unit of depth)pb=passi/braza7.6.2 How to shift the rangeThe basic range and range shift functions let you select the depth you can see on thescreen. This function is not available when the auto range mode is on or the bottomdiscrimination feature is active.Window can beshifted up anddown to selectstarting depth.Display7-9