In addition, some storage batteries may be more sensitive to frost.
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If you are sure that the fish is in the beam cone, but there are no fish
contours on the sonar screen (in Fish ID mode), then there may be
several reasons: if objects are observed in the RTS window and there are
no fish outlines, then it is possible that they are not fish, or the fish’s
movements do not meet the criteria of the algorithm stored in
the sonar’s
memory (it is better to switch to Pro mode). If there are no objects in the
RTS window, you need to increase the sensitivity until they appear. If this
does not help, it is most likely that the fish is near the bottom, and the
sonar does not see the fish because of the nature of the bottom and
bottom structures, or the fish is in the "dead zone" of the beam (not to be
confused with the deaf zone!).
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