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Nobeltec® Navigation Software User’s Guide
Sounder in NavView (Admiral Only)
The InSight Sounder has been designed to work especially well inside the
NavView interface mode. Using NavView, you can configure your InSight
Sounder to fill an the entire screen or one of multiple window panes. In
addition, you can create multiple Views, allowing you to step through chart,
3D, radar and sounder displays effortlessly.
into electrical pulses that can be converted into a visual image of that column
beneath your boat.
The Nobeltec InSight Sounder converts the electrical pulse returned by the
transducer into digital data that can be displayed on your computer screen,
which provides you with a running display of the water, objects and sea
floor beneath your boat. The strength of that reflected sound wave is also
visible. Stronger returns, which may represent large fish or hard surfaces, can
be represented in one set of colors, while weak returns from debris, small
schools of fish and soft sea floor can be represented with other colors.
22 - Sounder
Frequency of Sound Waves
Figure 22.16 - Sounder in NavView
ToolBar in NavView
All of the right-click menu items are available in the Sounder Display window
in NavView. When focus is given to the Sounder Display, a Sounder ToolBar
is available at the bottom of the screen (see Figure 22.16). Select Tool from
the menu in the bottom right-hand corner of the screen to make the Sounder
ToolBar appear. The right-facing chevron (arrow) indicates that additional
buttons are available for this ToolBar.
The frequency of the sound waves created by the transducer impacts the
type of reflected returns. Higher frequency sound waves, such as 200 kHz,
do not penetrate the water deeply, but they return greater detail from the
items they contact. For this reason, the InSight Sounder in 200 kHz frequency
is great for fish detection. However, transducers are rarely able to penetrate
deeper than 600 feet in 200 kHz mode. Lower frequency sound waves behave
in the opposite way. They offer much deeper depth penetration, but provide
less detail from objects they contact. All transducers offered by Jeppesen
Marine are dual frequency (50 kHz/200 kHz) .
The Information On Your Screen
Figure 22.17 displays a sample image from a sounder/fishfinder that calls
out the most notable elements. Stronger returns are represented with darker
colors and weaker returns in lighter colors.
Clutter
Old Data
Sounder and Fishfinder Basics
How It Works
A Sounder is capable of producing electrical pulses, which the transducer
converts into sound waves, sent downwards in a cone-shaped column. As the
sound wave hits objects in the path of that column, such as fish, seaweed,
debris, structures and eventually the sea floor, reflected sound waves are
returned to the transducer. The transducer converts returning sound waves
Surface Noise
Recent Data
School of Fish
Big Fish
Brush Pile
Bottom
Figure 22.17 - Sounder Sample