Bottom Discrimination Display - Furuno GP-1670F Operator's Manual

7. FISH FINDER OPERATIONS
7.4.4

Bottom discrimination display

The bottom discrimination display analyzes the bottom echo to categorize bottom
hardness in one of four types (rocks, gravel, sand, mud) and shows the results in a
colorful graphic display. A transducer or triducer that supports the bottom discrimina-
tion display 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.
Probability 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.
Hardness
legend
Characteristics of the bottom discrimination display
• The bottom discrimination display provides an estimate of bottom composition. Ac-
tual composition may be different.
7-6
Hardness legend
Rock Gravel Sand
Mud
Sand
Gravel
Rock
Graph example
Graph example
Mud probability
(Approx. 25%)
Sand probability
(Approx. 25%)
Rock probability
(Approx. 50%)
Probability
bar
Bottom
discrimination
display column
Mud
Probability
bar
Bottom
discrimination
display column