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Raymarine H6 - Owner’s Manual
An uneven bottom which is covered with rocks or coral produces a complex
display; the bottom image is irregular, with long tails pointing upward. A wreck
produces a similar image.
Notice that the lower layer of the image is shown as a lighter gray, indicating a
weaker echo. This could mean that the upper layer is soft; some sound waves may
get through this layer and be reflected by a more solid layer below.
It is also possible that the sound waves are making two complete trips - hitting the
bottom, bouncing off the boat, the reflecting off the bottom again. This can
happen if the water is shallow, the bottom is hard, or gain is set high.
Displaying targets
When a target is detected, it is displayed on the sonar screen as a mark. The size
and shape of this mark is influenced by a combination of factors:
Boat speed
The shape of a target changes along with the boat 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.
Target depth
The closer the target to the surface, the larger the mark on the screen. Individual
target depths can be displayed using the Target Depth ID function.
Target size
The larger the target, the larger the return on the sonar display. However, the size
of a fish target is dependent upon the size of the fish’s swim bladder rather than
it’s overall size. Swim bladder size varies from fish to fish.
Transducer frequency
The same target will appear differently when the transducer frequency is
changed. The lower the frequency, the broader the mark.
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Summary of Contents for H6
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