How To Select A Range Scale; How To Adjust The Gain (Sensitivity) - Furuno 1835 Operator's Manual

1. DESCRIPTION OF OPERATION
1.8

How to Select a Range Scale

The selected range scale, range ring interval and pulselength are shown at the upper-
left corner on the screen. When an objective target comes closer, reduce the range
scale so that a target appears in 50-90% of the display radius.
Use the RANGE key to select range. Press the "+" part of the key to raise the range;
the "-" part to lower the range.
1.9

How to Adjust the Gain (sensitivity)

The gain functions to adjust the sensitivity of the receiver for the best reception. The
gain can be adjusted automatically or manually.
1. Press the MENU key to open the menu.
2. Use the Cursorpad (
3. Use the Cursorpad (
4. Use the Cursorpad (
key. The window for Gain/Sea/Rain indicator shown below appears. [Auto] is for
adjusting the gain automatically. For [Manual], go to Manual mode below.
5. Press the CANCEL/HL OFF key to close the window.
6. Press the MENU key to close the menu.
Note: When you want to adjust the gain finely in [Auto] mode, rotate the GAIN knob.
The confirmation message appears. If you select [Yes], the mode changes to [Manual]
mode. Rotate the GAIN knob to adjust the gain.
Manual mode
1. Rotate the GAIN knob to adjust the gain so that weak noise appears on all of the
screen. If the gain is too low, weak echoes are erased. If the gain is too high, the
background noise hides weak targets.
2. Press the CANCEL/HL OFF key to close the window.
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or ) to select [Echo] and press the ENTER key.
or ) to select [Gain Mode] and press the ENTER key.
Gain Mode options
or ) to select [Auto] or [Manual] then press the ENTER
AUTO: Auto, MAN: Manual
Gain/Sea/Rain indicator
Are you sure to change to manual mode?
Confirmation message
Gain setting bar