Chapter 6: The Fishfinder 129
Chapter 6: The Fishfinder
The fishfinder uses acoustic sounding to display fish, seabed structure, and
underwater obstructions like wrecks.
6.1 The fishfinder display
The fishfinder displays a scrolling image of the seabed, updating from the right as
your vessel makes progress.
The fishfinder status icon is located in the top-right section of the monitor:
6.2 Background information
The fishfinder requires a Digital Sounder Module (DSM) to process acoustic signals
and build up a detailed picture of the seabed.
A transducer on the bottom of the boat 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.
The strength of the echoes is indicated on the display by different colors. You can use
this information to determine the shape and make-up of the seabed, or the size of
shoals, or of other objects.
Icon animated - connection to a DSM has been successful.
Icon static - the DSM is connected but not transmitting.
Icon greyed-out - no DSM is connected.
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81244_4.book Page 129 Thursday, January 31, 2008 1:53 PM
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