Simrad SN90, Operator'S Manual

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Using SN90 on purse seiners
For purse seine applications, the transducer is mounted on the port or starboard side of
the hull, facing the seine.
The transducer’s protected position
prevents damage from the purse wire,
and still gives you full control while
setting and retrieving the net. The
SN90 allows you to run alongside
a school of fish and observe, and
you can analyse the school without
passing over it. This is like using a
horizontal mounted echo sounder,
but with a lot more accuracy,
and with dedicated software and
presentation formats. Fish avoidance
is minimized, and more accurate
information about the fish in the
school can be obtained. You can
detect unwanted species, catch the
correct size and estimate the volume
of the school before setting the net.
In purse seine operations, the large frequency bandwidth makes the SN90 ideal for both
mackerel and tuna, and even for herring.
Simrad SN90 Operator Manual