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Nothing Comes Close to a Cobra
®
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3.7.1.1. Understanding the Fish Finder Echogram
The main elements that can be easily distinguished into an Echogram are:
Fish
Fish is represented as arc because of the cone angle of the transducer. In
fact as the boat passes over the fish the leading edge of the cone strikes
the fish, causing a display pixel to be turned on. As the boat passes over
the fish, the distance to the fish decreases turning each pixel on at a
shallower depth on the display. When the boat is directly over the fish, the
first half of the arch is formed and since the fish is closer to the boat, the
signal is stronger and the arch is thicker. As the boat moves away from the
fish, the distance increases and the pixels appear at progressively deeper
depths forming the remaining half of the arch. The FISH SYMBOL option,
found after pressing the MENU button, enables to set the actual sonar
data, fish symbols, or a combination of both. After changing the Frequency
of a sonar signal the graphical presentation of items may change slightly.
Thermoclines
Are the zones where two layers of different water temperatures meet. The
greater the temperature differential, the thicker the thermocline is shown
on the screen. Thermoclines are represented as horizontal stripes of noise.
They are very important for fishing since often many species of game fish
like to suspend in, just above, or just below the thermoclines.
White Line
The White Line shows the difference between hard, soft bottoms and even
distinguishes between fish and structures located near the bottom. In this
way it is easier to tell the difference between a hard and soft bottom and
even to distinguish fish and structures located nearby the bottom. For
example, a soft, muddy or weedy bottom returns a weaker echo that is
shown with a narrow white line while a hard bottom returns a strong echo
that causes a wide white bottom line.
Fish Finder Page