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piles) and a wide range of other potential objects (sunken boats, reefs).
Humminbird® units excel at showing structure with great detail over a wider area
due to unique sonar configurations developed for the angler.
Structure ID®:Structure ID® isa Humminbird® featurethat describes thetraditional
grayscale method of presenting sonar information. See Grayscale.
Surface Clutter: Surface Clutter is a phenomenon where sonar returns are reflected
off of tiny objects near the surface of the water, including algae and even air
bubbles. Typically, saltwaterenvironments have significantly greater surfaceclutter
than freshwaterdue tocontinuous windandwave actionthat causesaerationat the
surface. The Surface Clutter menu provides manual control to bias the default
settings under extreme conditions.
Target Separation: Target Separation is the measurement of minimum distance
that a fishfinder needs to be able torecognize two very close objects as two distinct
targets (i.e. two fish hanging very close, or a fish hanging very close to structure).
Humminbird® findfinders provide a very good 2 1/2 inches of target separation in
shallower than 100 feet of depth. Target separation decreases as depth increases
due to the need for a longer Pulse Width to achieve greater depth. See Pulse Width.
Thermoclines: Thermoclines are water layer(s) of distinctly different temperatures
that createa sonarreflection dueto thedensityof thediffering watertemperatures.
Typically a thermocline will appear as a continuous band across the display atsome
distance above thebottom contour. Thermoclines areof interest to anglersbecause
fish will suspend above or below the thermocline as they seek the optimum
temperature and oxygen levels.
Time Variable Gain: Time Variable Gain is a processing step applied to the sonar
return to"normalize" thedata so thatobjects ofequal size (i.e.fish) appearto be the
same size, even if they are separated by a good distance. Time Variable Gain is a
fundamental attribute of good sonar.
Total Screen Update®: A Humminbird® feature that refreshes and updates all the
sonar information on the display when a range change occurs. Without Total
Screen Update®, only the most recent sonar information would be drawn to the
new range, and the old sonar information would continue to scroll off the screen
at the old range.