GP1670F_1870F Operator's Manual - Furuno USA

7. FISH FINDER OPERATIONS7.4.4 Bottom discrimination displayThe bottom discrimination display analyzes the bottom echo to categorize bottomhardness in one of four types (rocks, gravel, sand, mud) and shows the results in acolorful graphic display. A transducer or triducer that supports the bottom discriminationdisplay is required.There are two bottom discrimination displays: graphic and probability.Graphic display: The most probable material on the bottom (mud, sand, gravel, rock)is indicated graphically.Hardness legendProbabilitybarBottomdiscriminationdisplay columnRock Gravel Sand MudProbability bar:Degree of trust for bottom discrimination display(Green, Normal; Yellow, Caution;Background color, Abnormal)Probability display: The most probable bottom material is indicated in proportion.ProbabilitybarHardnesslegendMudSandGravelRockBottomdiscriminationdisplay columnGraph exampleMud probability(Approx. 25%)Sand probability(Approx. 25%)Rock probability(Approx. 50%)Characteristics of the bottom discrimination display• The bottom discrimination display provides an estimate of bottom composition. Actualcomposition may be different.7-6