Furuno GP-1610CF Operator's Manual page 100

Returning signal
The ultrasonic pulse transmitted by the trans-
ducer "strikes" intervening objects such as the
bottom and fish schools and returns to the
transducer. The signal received at the trans-
ducer is called the returning signal.
Sounding range
Sounding range refers to the maximum depth
observable in the range in use. For example,
if the range selected is 0-100 meters, the maxi-
mum depth which you can observe is 100
meters. Of course, factors such as bottom com-
position and water conditions may affect the
sounding range.
A-8
Transducer
A transducer converts an electrical signal into
an ultrasonic signal, transmits it in the water
and receives any returning signals from inter-
vening objects. The higher the frequency of
the transducer the sharper its beamwidth.
Transducers are generally classified accord-
ing to their method of installation. There are
three general classes: thru-hull, transom
mount or inside hull. The thru-hull type pro-
vides the best performance since the trans-
ducer protrudes from the hull and the effects
of air bubbles and turbulences are minimal.
Water temperature sensor
The water temperature sensor (option) mea-
sures water temperature near the transducer.
A combination water temperature and speed
sensor is also available.