Bottom Lock.
[MENU] + "BOTTOM RANGE" + [ENTER]
3.1.5 Depth
This option is available only when Range Mode is Manual and it is disabled in Auto Range and Bottom Lock Mode.
[MENU] + "DEPTH" + [ENTER]
3.1.6 Shift
Shows the depth from which start the bottom scanning. This option is available only when Range Mode is Manual and it is disabled in Auto Range and Bottom Lock Mode.
[MENU] + "SHIFT" + [ENTER]
NOTE The Bottom Range, Depth, Shift will apply to the currently selected frequency.
3.1.7 Frequency
Allows you to choose the frequency among Auto, 50 kHz or 200 kHz when single frequency page is selected.
[MENU] + "FREQUENCY" + [ENTER]
3.1.8 Interference Rejection
elects a filter to remove interference from other Fish Finders.
[MENU] + "INTERFER REJECT" + [ENTER]
3.1.9 Sensitivity
The Sensitivity menu is accessible both from the Fish Finder Setup menu and by pressing [ENTER] when in Fish Finder pages. All settings in the Sensitivity menu are related to the Frequency selected.
[MENU] + "SENSITIVITY" + [ENTER]
Fig. 3.1.12 - Fish Finder Sensitivity menu
NOTE The Frequency value is only displayed: to select the desired frequency see the previous Par. 3.1.11 .
3.1.9.1Frequency
This option is available only in the Dual Frequency page. It allows you to select the Frequency to which the Sensitivity parameters are applied.
3.1.9.2Gain
Allows you to control the Gain of the unit's receiver. To see more details on the screen, increase the receiver sensitivity by selecting a higher gain percentage. If there is too much detail or if the screen is cluttered, lowering the sensitivity may increase the clarity of the display.
3.1.9.3STC
Sensitivity Time Constant: it is a time varying gain curve which attenuates the sonar receiver gain in shallow water, increasing the gain gradually as the depth
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