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Simrad SN90 Operator Manual
The sonar have a horizontal coverage
area of maximum 160°, and the
vertical beam width is typically
6°. The beams can be tilted with
limits depending on the angle of the
transducer installation. In addition
to this, five adjustable split-beam
inspection beams of typically 6x6°
can be used for a more detailed
study of a school, such as observing
fish behaviour, target strength and
biomass.
The absence of a hull unit allows
for easier and less space demanding
installation, and the transducer is
either mounted flush with the hull
plating, or in a streamlined blister.
The transducer installation removes
the chance to get tangled up or
damaged by wires, and greatly
reduces the risk of being damaged
by objects in the water.
Note
The SN90 can be delivered with a hull unit.
The SN90 provides a number of standard interface lines for communication with
peripheral devices and sensors. Typical inputs are geographical information from a
positioning system, vessel speed and current heading. In order to operate correctly,
the SN90 requires input from a motion reference unit (MRU). Without the input from
a motion reference sensor, the SN90 will not be able to compensate for the vessel
movements. This lack of compensation will prevent the SN90 from providing correct
echo information. Kongsberg Maritime may provide a suitable motion reference unit.
The narrow beams provided by the SN90 give you several advantages.
• They increase the range and resolution, and offer a vertical view with additional
details and a clearer picture.
• They make the SN90 even more ideal when you need to search for fish close to the
sea bottom, or close to the surface, at long ranges.
• They provide a far better vertical view with less "bottom climbing" that what is seen
on sonars with a wider beam.
• The narrow beams also decrease the noise level.
14
Inspection beams
381295/B
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