Navman FISH450 Tricolor Manual De Instalación Y Funcionamiento página 8

Shadows
Shadows are areas where the ultrasonic beam cannot 'see'. These
include hollows on the bottom or beside rocks and ledges where the
strong echo returned off the rock obscures the weaker echo of the fish.
When looking for small objects including fish, users should consider that
there are places where fishfinders cannot 'see'.
Shadow - where objects are hidden in the bottom echo.
These fish will be hidden in the bottom echo.
Range
Range is the depth of water displayed vertically.
The FISH450 Tricolor has two range modes, Auto
Range and Manual Range:
• In Auto Range, the unit adjusts the depth
range so that the bottom is shown in the
lower part of the screen. The use of Auto
Range is recommended.
• In Manual Range, the range can be set by
pressing the Increase Range or Decrease
Range key.
To switch between Auto Range and Manual Range
hold the Increase Range or Decrease Range key
down until the dialogue box "Auto Range" or
"Manual Range" briefly appears.
Manual Range is useful to prevent the screen
redrawing when there are rapid changes in depth.
(E.g. looking at the sea floor surrounding a pinnacle.)
Gain
Gain controls the amount of detail displayed on
the screen. The FISH450 Tricolor has two gain
modes, Auto Gain and Manual Gain.
• In Auto Gain, the gain is automatically
adjusted. The use of Auto Gain is
recommended.
• Manual Gain can be set between 1 and 9, low
values may not show enough detail, while too
high a setting may clutter the screen. When in
Manual Gain the gain symbol
followed by the gain level.
To switch between Auto Gain and Manual Gain,
hold the Increase Gain or Decrease Gain key down
until the dialogue box "Auto Gain" or "Manual Gain"
briefly appears.
See the Sonar screen section 3-3 for more
information.
NAVMAN
FISH450 Tricolor FISHFINDER Installation and Operation Manual
Bottom Lock
Bottom Lock fixes the Zoom Bar to the bottom, so
the bottom is always displayed in the Zoom
Section, regardless of changes in depth.
To turn Bottom Lock on, move the Zoom Bar down
until it touches the bottom and the dialogue box
"Bottom Lock On" briefly appears. To turn Bottom
Lock off press the Cursor Up key.
Should the bottom rise to meet the Zoom Bar when
bottom lock is off, the Zoom Bar will temporarily track
the bottom. This condition will cease when the depth
exceeds the original depth of the Zoom Bar.
appears
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