GP1670F_1870F Operator's Manual - Furuno USA

7. FISH FINDER OPERATIONS• The 600 W transducers and triducers that support the bottom discrimination featureare 520-5PSD, 520-5MSD, 525-5PWD, 525STID-MSD, 525STID-PWD.• The 1 kW transducers that support the bottom discrimination feature are 50/200-1Tand 50/200-12M.• The high and low frequencies are alternately transmitted, regardless of current displayselection. The TX interval is slower when this feature is active.• Operating environment:- Depth: 16 to 328 ft- Speed: 10 knots or less• The bottom discrimination feature uses the distance from your boat’s draft. Be sureto enter your boat’s draft.How to set the bottom discrimination display1. Open the [FISH FINDER] menu and select [BOTTOM].2. Select [BOTTOM DISCRIMINATION].3. Select [Graphic], [Probability] or [Off].[Graphic]: Show the most probable bottom composition in four colors or graphform.[Probability]: Show the most probable bottom composition in graph form.[Off]: Turn off the bottom discrimination display.4. Select [LEGEND].5. Select [On] or [Off] to show or hide the hardness legend (at the bottom of the bottomdiscrimination display).Graphic legendProbability legend6. Press the ESC/MENU key to close the menu.7-7