Garmin 188c User Manual

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The transducer acts as the eyes and ears of your new sonar. Proper 

transducer installation is 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. 

X

X

dead zone

fish not seen

Wide cone angle

Narrow cone angle

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 installations. 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. Dual frequency transducers give you the best 

of both wide and narrow cone angles.
A 50/200 kHz dual frequency 40°/10° cone angle, temperature 

sensing, transom mount transducer is included in the 

GPSMAP 188/188C Sounder (with transducer) package. This 

transducer provides good all-around performance.