Furuno GP-1871F, Руководство оператора

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6. FISH FINDER
6-5
istics, etc. Set the gain to show a slight amount of noise on the screen. Increase the
gain for greater depths and lower the gain for shallow waters.
To adjust the gain , tap the cogwheel icon to open the [Settings] menu then drag the
slide bar at [Gain Value], or tap the keyboard icon at [Gain Value] to input the gain val-
ue.
6.5.3 How to offset the bottom echo
When the seabed does not appear on-screen with [Auto Range] active, you can offset
where the seabed is displayed on-screen.
1. Tap [Home] => [Settings] => [Fish Finder] => [Bottom Range Shift Area].
2. At [Upper Limit], set the start of the area where to show the bottom echo. For ex-
ample, setting 75% would place the bottom echo at a position equivalent to 75%
from the top of the screen.
3. At [Width], then set the width of the bottom echo, proportionate to the display
screen. For example, a setting of 10% would show the bottom echo at no more
than 10% of the width of the display.
4. Close the menu.
6.6 Manual Fish Finder Operation
Use the manual operation to see schools of fish and the bottom echo with a fixed gain
setting.
6.6.1 How to select the manual mode
To select the manual mode , tap the cogwheel icon to open the [Settings] menu then
tap [Manual].
6.6.2 How to select a display range
Range can be selected automatically or manually. Tap the cogwheel icon to open the
[Settings] menu then tap the [Auto Range] toggle box to select [ON] or [OFF].
[ON]: The range is automatically adjusted to always display the bottom echo at the
lower of the screen. The range slider bar is not available.
[OFF]: Change the range with the range slider bar. Drag the bar, use the pinch motion
or tap the +/- icons to set the range.
6.6.3 How to shift the range
The basic range and range shift functions let you select the depth you can see on the
screen. This function is not available in the following circumstances: Auto Range
mode is on; ACCU-FISH
™
feature is on; or Bottom Discrimination feature is on.
To adjust the shift , drag the echo display up to go deeper, or down to go shallower.