Using Dual Beam - Garmin FishFinder 340C Owner's Manual

Using Dual Beam

Dual beam works best for shallow water (for example, inland)
applications. A dual beam transducer can transmit a narrow or a
wide beam. The water area covered by the transmitted sound waves
is determined by the beam width of the transducer and the water
depth. The narrow beam provides crisp detail of what is under your
boat, and is very helpful if you are fishing in deeper water where
the beam covers more area (for example, at a 30-foot depth, the
narrow beam covers the area of about a 7-foot circle).
Narrow
Beam
Fishfinder 340C Owner's Manual
The wide beam is more helpful in shallow water, because it gives
you a much wider view of objects in the water, including areas
beyond the sides of your boat. At a 30-foot depth, the wide beam
covers the area of approximately a 20-foot circle.
Understanding the Fishfinder Screen
Experimentation and experience are the keys to successfully
interpreting your Fishfinder screen. We recommend that you take
your Fishfinder out on familiar water, and spend time learning to
interpret what you see on the Fishfinder 340C screen.
Think of the Fishfinder screen as if you took a picture from the
side of an aquarium in your home. You can see how deep a fish is
in the water (how close it is to the top or bottom), but you cannot
tell where the fish is located horizontally in the water (whether it is
near the front or the back of the aquarium). Remember this when
you are trying to locate exactly where something is in the water.
Wide
Beam
G S > U
ETTING TARTED NDERSTANDING THE
F S
ISHFINDER AND ONAR
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