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22 Fishfinder 160C Owner’s Manual
APPENDIX > TRANSDUCER COVERAGE AND UNDERSTANDING THE GRAPH
Transducer Coverage
Understanding Transducer Coverage
The bottom area covered by the transmitted sound waves is
determined by the beam width of the transducer, and the water
depth. The Fishfinder 160C can transmit either a Narrow or Wide
beam. The Narrow beam provides crisp bottom and structure detail,
but the coverage area is limited. As shown in the illustration below,
at a 30 foot depth the Narrow beam covers the area of a 6-foot
circle. The Wide beam covers a much larger area, but with some
loss of bottom and structure detail. As illustrated below, at a 30-foot
depth the Wide beam covers the area of a 20-foot circle.
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Understanding the Graph
It is important to understand that the unit does not display a 3-D
representation of the underwater environment. The unit can display
multiple things at the same time, but cannot determine where the
return originated—only when it was received.
Examples 1 and 2 provide a look at the underwater world from a
top view, and illustrate how these views would be displayed on the
graph. On both graphs it appears the fish and tree are side by side
as shown in Example 1. However, when we look at Example 2, we
see that the fish can be several feet from the tree. It is important
to remember that the Fishfinder cannot determine where in the
coverage area the tree or fish are, only that the returns were received
at the indicated depths in the same time frame.
Example 1
Branches
Fish
Example 2
Fish
Branches
Wide Beam
Narrow Beam
26


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