Furuno GP-3500F - Manual (Page 204)

11. VIDEO SOUNDER OPERATION
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6. Rotate the [ENTER] knob to select the function, and then press the [ENTER]
knob.
Note that the function of “E/S GAIN” is available for the [GAIN] key only.
7. Press the [MENU] key several times to close the menu.
Function keys
Menu item Function
E/S SHIFT Shows the SHIFT window.
E/S RANGE Shows the ECHO SOUNDER RANGE window.
E/S GAIN Shows the GAIN window.
E/S AUTO MODE Shows the AUTO MODE window.
E/S NOISE LIMITER Shows the NOISE LIMITER window.
E/S CLUTTER Shows the CLUTTER window.
E/S WHITE MARKER Shows the WHITE MARKER window.
E/S HUE Shows the HUE window.
E/S SIGNAL LEVEL Shows the SIGNAL LEVEL window.
E/S PICTURE ADV Shows the PICTURE ADVANCE window.