Planing hulls at speed
produce air bubbles and
turbulent water that
bombard the transducer.
The resulting ultrasonic
noise may be picked up
by the transducer and
obscure the real echoes.
Frequency and cone width
Water Depth
ft/m
Cone width at 50
kHz
Cone width at 200
kHz
45˚ cone 11˚ cone
Clarity of water. Particles or air in the water reduce •
the strength of the echo.
Composition or density of the object or bottom.•
Bottom types
Mud, weed and sandy bottoms tend to weaken and
scatter the echosounder pulse, resulting in a weak echo.
Hard, rocky or coral bottoms reect the pulse, resulting
in a strong echo.
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