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7. FISH FINDER OPERATIONS
7-6
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 display: The most probable bottom material is indicated in proportion.
Characteristics of the bottom discrimination display
• The bottom discrimination display provides an estimate of bottom composition. Ac-
tual composition may be different.
Bottom
discrimination
display column
Probability
bar
Hardness legend
Probability bar:
Degree of trust for bottom discrimination display
(Green, Normal; Yellow, Caution;
Background color, Abnormal)
Rock Gravel Sand Mud
Hardness
legend
Bottom
discrimination
display column
Probability
bar
Mud
Sand
Gravel
Rock
Graph example
Mud probability
(Approx. 25%)
Sand probability
(Approx. 25%)
Rock probability
(Approx. 50%)
Graph example