15.1 How the fishfinder works
The fishfinder application uses a sonar module and a suitable sonar
transducer. The sonar module interprets signals from the transducer
and builds up a detailed underwater view.
The transducer is located on the bottom of the boat, it sends pulses
of sound waves into the water and measures the time it takes for the
sound wave to travel to the bottom and back. The returning echoes
are affected by bottom structure and by any other objects in their
path, for example reefs, wrecks, shoals or fish.
Colors are used on the display to indicate the strength of the returns.
You can use this information to determine the bottom structure,
the size of fish and other objects in the water, such as debris or
air bubbles
Note:
Some transducers include additional sensors to measure
water temperature and/or speed.
15.2 Raymarine sonar modules
The table below lists Raymarine’s sonar modules and whether
CHIRP technology is used.
DSM30
clear pulse – non-CHIRP
DSM300
clear pulse – non-CHIRP
CP450C
clear pulse – CHIRP
New a Series (internal sonar)
clear pulse – non-CHIRP
New c Series (internal sonar)
clear pulse – non-CHIRP
New e Series (internal sonar)
clear pulse – non-CHIRP
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