Vexilar FL-10 - Manual (Page 15)

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Another type of noise is acoustical. This comes from the
transducer picking up noise from turbulent water under the
transducer. This can be due to a poor transducer mounting
job or from engine exhaust or trolling motor thrust passing
under it. Acoustical noise can be eliminated by adjusting the
transducer’s location or position.
HIGH SPEED OPERATION
The FL-10 can accurately read depths at almost any boat
speed. Here high speed is defined as any speed at or above
the planning speed of the boat. Once the boat starts to plane
out, turbulence will develop behind the transom. If you are
using the wrong type of transducer, or it is poorly mounted,
the unit will lose the bottom at a certain boat speed or fill the
display with acoustical noise. This is due to all of the air
bubbles in the turbulent water. Make sure you are using the
proper transducer for your application and that you follow
the mounting instructions carefully.
NAVIGATION
Although the FL-10 can give you a very fast update of
depth information, use common sense when navigating. Even
though you can see the depth get shallow fast, you may not
be able to react fast enough to avoid danger. Please navigate
with extreme caution.