Raymarine E Series Guia de Instalação Página 125

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Chapter 6: Using the Fishfinder 6-3
How do I interpret the bottom structure?
The bottom usually produces a strong echo. These images indicate the bottom
conditions as follows:.
The dark layers indicate a good echo; the lighter areas weaker echoes. This could mean
that the upper layer is soft and therefore allowing sound waves to pass to the more
solid layer below.
It is also possible that the sound waves are making two complete trips – hitting the
bottom, bouncing off the boat, then reflecting off the bottom again. This can happen if
the water is shallow, the bottom is hard, or gain is set high.
The Fishfinder provides various features to help you interpret the fishfinder picture.
How are targets displayed?
When a target is detected, it is displayed on screen as a mark.
What factors influence how targets are displayed?
The shape and size of this mark is influenced by a combination of factors:
Boat speed
The shape of the target changes along with your speed. Slower speeds return flatter,
more horizontal marks. As your boat’s speed increases, the target will tend to thicken
and arch slightly; until at fast speeds the mark resembles a double vertical line.
D6855-1
A hard bottom (sand) produces a thin line
A soft bottom (mud or seaweed cover) produces a wide line. The dark
layer indicates a strong signal.
-
A rocky or uneven bottom or a wreck produces an irregular image with
peaks and troughs
81244_1.book Page 3 Wednesday, December 1, 2004 11:41 AM
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