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Sonar targets which are not physically
attached to the bottom may take one of many
shapes. Surface clutter is the layer of water
near the surface which is rich in algae and
other growth, and often is aerated by wind or
wave action. This area of water interferes
with sonar transmission and often appears
on-screen as regular clusters of individual
dots near the "0" line.
Thermoclines are sharp differences in water
temperature. These are easily identified by
the continuous nature of the return.
ID+ adds an additional piece of information to
help the user locate fish. On selected fish
symbols, the digital depth of the designated
fish is drawn to help locate the fish vertically. This is especially helpful in setting bait depths or for
downrigger operation.
A further method of differentiation of fish symbols indicates which of the two sonar beams the fish
is detected in. This gives you a reliable indicator of side to side location relative to boat
movement. Fish symbols which are hollow are detected in the Wide beam. Solid fish symbols
represent fish which are detected in the Narrow beam, and these fish are directly under the boat.