Garmin Fishfinder 100 BLUE Owner's Manual

Also see for Fishfinder 100 Blue: Specifications

1InstallationTransducersTransducersThe transducer acts as the eyes and ears of your new sonar. Propertransducer selection and installation are critical to the operation of yourunit.Included in the Optional Package is a 200/50kHz frequency (10°/40°cone angle), depth and temperature sensing, transom mount transducer.This transducer provides good all-around performance. Other optionaldual frequency transducers are available from your local dealer or GARMIN.The transducer transmits sound waves toward the bottom in a coneshape. The wider the cone angle, the larger the coverage area at a givendepth. While it is good to see as large of an area as possible, it is best toselect a frequency setting that suits the water that you are on.With a dual frequency transducer, you may select either a 200kHzfrequency, a 50kHz frequency or both. The 50kHz frequency settingprovides a wide cone angle. This wide cone angle produces a large coveragearea, but less detailed bottom resolution. In areas where bottom contourschange quickly, this can result in “dead zones” where fish cannot be seen.In contrast, the 200kHz frequency setting provides a narrow coneangle. This narrow cone angle produces a smaller viewing area (comparedto a wide cone angle at the same depth), but with improved bottomresolution and a smaller dead zone.The Dual frequency setting will provide you the most accurate depthand fish returns by transmitting signals at both 200kHz and 50kHz.XXdead zonefish not seenwide coneanglenarrow coneangle