Garmin Fishfinder 240 Blue Owner's Manual - Page 9
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Transducers
The transducer acts as the eyes and ears of your new sonar. Proper
transducer selection and installation are critical to the operation of your
unit.
The transducer transmits sound waves toward the bottom in a cone
shape. The larger the cone angle the larger the coverage area at a given
depth. While it is good to see as large of an area as possible, it is best to
select a transducer that suits the water that you are on.
A wide cone angle transducer works best in shallow water. The wide
cone angle provides a large coverage area, but at a decreased bottom
resolution. In deeper water this can result in a large dead zone where
fish cannot be seen.
A narrow cone angle transducer is better suited to deep-water installa-
tions. The narrow cone angle provides a smaller viewing area (compared
to a wide cone angle transducer at the same depth) with improved bottom
resolution and a smaller dead zone.
Included in the Optional Package is a 20° cone angle, temperature sens-
ing, transom mount transducer. This transducer provides good all-around
performance. A variety of optional transducers are available from your
local dealer or GARMIN.
Installation
Selecting a Transducer
Wide cone angle
Narrow cone angle
dead zone
X
fish not seen
X
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