Eagle Electronics SeaFinder 480DF - Manual (Page 47)

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Adjusting sensitivity in Manual Sensitivity Mode is similar to driving a
car without cruise control — you have complete manual control of the
car's speed. In the sonar unit, manual mode allows you to set
sensitivity at 100 percent (maximum) or zero percent (minimum.)
Depending on water conditions, the bottom signal may completely
disappear from the screen when you reduce sensitivity to about 50
percent or less!
These figures show results of different sensitivity levels on the same
location. Fig. 1: Sensitivity at 88 percent, determined by Auto Sensitivity.
Typical of full auto mode. Fig. 2: Sensitivity set at 75 percent. Fig. 3:
Sensitivity set at 50 percent. Fig. 4: Sensitivity set at 100 percent.
Try adjusting sensitivity in both auto and manual modes to see how
they work.
Fig. 3 Fig. 4
Fig. 1 Fig. 2