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The narrow cone angles (10°) associated with 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 2/10 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.
Dual frequency mode combines both frequencies to get the best
coverage area and contour/depth readings.
40° Cone Angle (50 kHz)
Coverage
Diameter
Depth
10° Cone Angle (200 kHz)
Coverage
Diameter
Depth
GPSMAP 276C Owner’s Manual 99
SETTING UP AND USING SONAR > UNDERSTANDING SONAR