Furuno GP-1870F, Руководство оператора

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7. FISH FINDER OPERATIONS
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7.18 FISH FINDER Menu
This section provides the descriptions for the items in the [FISH FINDER] menu that
have not been mentioned previously.
[BACKGROUND COLOR] : Select the background color, among black, dark blue,
light blue, white and monochrome (echoes appear in tones of gray.)
[COLOR BAR] : Turn the color bar on or off.
[BOTTOM RANGE SHIFT AREA] : Select the position at which to show the bottom
echo, when Auto Range is active. There are two settings, [Upper Limit] and [Width].
[Upper Limit] sets how far to place the echo from the sea surface. For example, setting
75% would place the bottom echo at a position equivalent to 75% from the sea sur-
face. [Width] determines how much deviation to allow for before shifting the position
of the bottom echo. For example, selecting 5% would shift the bottom echo when its
position changes by ±5% or more of the [Upper Limit] setting.
[ZERO LINE REJECTION] : Turn the zero line (transmission line) on or off. When
turned on, the transmission line disappears, which allows you to see fish echoes near
the surface clearly. The length of the transmission line changes with transducer used
and installation characteristics. If the width of the transmission line is 4.5 ft (default val-
ue) or more, set the transmission line width with [ZERO LINE RANGE].
[ZERO LINE RANGE] : This feature adjusts the transmission line so that the line dis-
appears when the menu item [ZERO LINE REJECTION] is turned on. For a long tail,
increase the value. If the transmission line does not disappear, lower the TX power.
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