Garmin GPSMAP 298C Owner's Manual - Page 96
Installing the Transducer, transducer at the same depth with improved bottom resolution
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APPENDIX > INSTALLING THE TRANSDUCER Installing the Transducer 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. 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 298 (with transducer) package. This transducer provides good allaround performance. dead zone fish not seen X X 90 GPSMAP 292/298 Owner's Manual