New Transducers 250C 用户手册

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Fishﬁnder 250/250C Owner’s Manual

Btm (Bottom) Split––shows two reduced pictures, the right

at the original depth scale and the left showing only sonar

returns close to the bottom. The bottom is displayed as a ﬂat

line across the bottom of the screen, and returns are shown

at their distance from the bottom. You can adjust the scale of

the Bottom Split display by changing the Span setting (see

below).

Btm (Bottom) Lock––displays the Bottom Lock (returns

close to the bottom, shown at their distance from the bottom)

picture on the full screen. You can adjust the scale of the

Bottom Lock display by changing the Span setting (see

below).

• View/Span—available when a Zoom scale other than No

Zoom is selected. The View or Span settings are used to

change the viewing range of a zoomed display. The View

option is enabled when the display is set to 2x Split, 2x

Zoom, 4x Split, or 4x Zoom. If the display is 2x or 4x split,

only the zoomed portion on the left side of the display is

affected by the change. If the display is

Bottom Split or

Bottom Lock, the Span option adjusts the area from the

bottom for which the unit displays data.

• Gain—controls the sensitivity of the unit’s receiver. This

provides some ﬂexibility in what is seen on the display. To

see more detail, 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.

Sonar view adjustment

• Target Level—adjusts which colors (Fishﬁnder 250C) or

shades of gray (Fishﬁnder 250) are used to display sonar

information. A Color Bar (page 23) is displayed on the

right side of the screen as you adjust this setting. A higher

percentage results in more strong-signaled colors or shades

(page 15) displayed on the Sonar page. A lower percentage

results in more weaker-signaled colors or shades (page 15)

displayed on the Sonar page. This setting does not increase/

decrease the unit Gain.

• Whiteline—controls how the unit displays information about

the bottom type (hard or soft). When turned

Off, all high-

intensity bottom returns are displayed as red on the Fishﬁnder

Bar

represents

area shown

on 2x view