GPSMAP 527xs with transom mount transducer, includes map world base pre-installed. Independently of the type of installation (to the evenness, fixed or with gyratory support) it is visible so much by day as by night. It is very easy to use. Compatibility with CHIRP.
Sounders for fishing detection and determination of the depth, the less visible is the transducer element; however, it is the most important. For information to be displayed on the display indicating the depth, bottom type and presence of fish screen the transducer is operated emitting and receiving waves several thousand times per second.