Transducer coverage, Understanding transducer coverage, Understanding the graph – Garmin 160C User Manual

Page 26

Fishﬁnder 160C Owner’s Manual

PPENDIX

RANSDUCER

OVERAGE

AND

NDERSTANDING

THE

RAPH

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