Garmin GPSMAP 496 Owner's Manual (for Europe) - Page 136
Transducer Coverage, kHz provide better bottom resolution and crisper detail,
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Setting up and Using Sonar > Understanding Sonar Transducer Coverage The area covered by the transmitted sound waves is determined by the cone angle of the transducer and the water depth. The wide cone angles (40°) associated with low frequencies (50 kHz) provide Coverage Depth a large coverage area for finding fish within a coverage width that diameter is approximately 2/3 of the water depth. However, this also means that wide cone angles produce less bottom detail and resolution. As shown in the drawing on the near right, the 40° cone angle produces Coverage diameter Depth a coverage area of approximately a 20-foot diameter circle at a 30-foot depth. The narrow cone angles (10°) associated with the high frequencies (200 kHz) provide better bottom resolution and crisper detail, but cannot show a large coverage area for finding fish. The 10° cone angle provides a coverage width that is approximately 1/5 of the water depth. As shown in the drawing on the far right, the 10° cone angle produces a coverage area of approximately a 6-foot diameter circle at a 30-foot depth. 40° Cone Angle (50 kHz) 10° Cone Angle (200 kHz) Dual frequency mode combines both frequencies to get the best coverage area and contour/depth readings. 128 GPSMAP 496 Owner's Manual
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