Operation Manual

116
User Manual
Operating Frequency
Readout of the selected operating frequency.
6.2.1 UNDERSTANDING THE ECHOGRAM DISPLAY
The main elements that can be easily distinguished into an Echogram are:
Fig. 6.2.1 - The Fish Finder echogram
Fishes
Fishes are represented as arcs 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.
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 fishes 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 fishes 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.