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CPF180i and CPF300i Page 109
17. FISH FINDER
The Fish Finder consists of a high power transmitter, sensitive receiver and a transducer.
The Fish Finder sends an electrical pulse to the transducer, which contains an element that
converts the pulse into acoustic (sound) waves, which is sent through the water. As this
wave travels from the transducer to the bottom, it may strike fish, structures, thermalclines
(temperature changes in the water). When the wave strikes an object(s) a certain amount
of the wave is reflected back to the transducer depending on the composition and shape of
the object. When the reflected wave is returned to the transducer it is converted into a
voltage and is amplified by the receiver, processed and sent to the display. The speed of
sound in water is roughly 4800 Ft/sec, so the time lapse between the transmitted signal and
the received echo can be measured and the distance to the object determined.
Figure 17 - Fish Finder working principle
17.0 SOFTWARE SETUP
The internal Fish Finder may be enabled (default setting) or disabled by following the
procedure:
1. From the Chart page, press [MENU]. Move the ShuttlePoint knob to highlight
SETUP
MENU and press [ENT].
2. Move the ShuttlePoint knob to highlight
ADVANCED SETUP and press [ENT] or move
the ShuttlePoint knob to the right.
3. Move the ShuttlePoint knob to highlight
IN/OUT CONNECTIONS and press [ENT] or
move the ShuttlePoint knob to the right.
4. Move the ShuttlePoint knob to highlight
FISH FINDER and press [ENT] or move the
ShuttlePoint knob to the right.