Eagle Electronics FISHMARK 640C - Manual (Page 53)

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These figures show results of different sensitivity levels on the same lo-
cation. Fig. 1: Sensitivity at 88 percent, determined by Auto Sensitivity.
Typical of full auto mode. Fig. 2: Sensitivity set at 75 percent. Fig. 3: Sen-
sitivity set at 50 percent. Fig. 4: Sensitivity set at 100 percent.
You can change the sensitivity level whether you are in Auto Sensitivity
mode or Manual Sensitivity mode. The adjustment method works the
same in both modes, but it gives you slightly different results.
Fig. 1
Fig. 2
Fig. 3 Fig. 4