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of enhancing the apparent sensitivity because the weaker signals appear bolder.
Inverse grayscaleworkswell invery clearwater. Debris-ladenwater oftenappears as
a lot of clutter on the screen.
Instant Image Update: Instant Image Update is a Humminbird® feature that
updates all the sonar information on the display when Sensitivity and a variety of
sonar settings (Bottom View, Range, etc.) are modified. This differs from the
traditional functionality thatonlyupdates thenew sonar information collectedafter
the setting change. Instant Image Update permits more accurate fine-tuning of the
display because the user can see the results on the complete sonar graph. When
combined with the Freeze Frame feature, the user can adjust and understand the
effects of many different sonar settings quickly and easily.
Maximum DepthMenu: The MaximumDepth Menu is aHumminbird® feature that
optimizes performance based on the maximum operational depth set by the user.
Many Humminbird® units can operate across a very broad depth range (up to 2500
feet) whichcausesthe unitto "look"upto thatfull depthundersome circumstances.
Due to the speed of sound in water, this can result in less responsiveness because
the unithas to waitfor a longerperiod of timeto receivethe sonar signal.When the
Maximum Depth menu is set to a lower value, the unit only looks up to the setting,
which increases the responsiveness of the unit. This is an important feature for
anyone operating in shallower depths!
Noise: Noise is unintentional, external sound waves that interfere with the optimal
operation of sonar. Noise appears as random"dots" on the display, and is caused by
a variety of sources. Electrical noise (from trolling motors, bilge pumps,VHF radios)
typically manifests as a consistent dot pattern. Electrical noise can be isolated by
selectively turningon andoff other electrical devicesto determine thesource. Often
re-routing the power cable, or connecting to an alternative power supply (second
battery) can help overcome electrical noise. Hydrodynamic noise (from propeller
and/or hull cavitation) has a more random appearance and is generally related to
boat speed, so that faster operation results in more noise. Hydrodynamic noise can
be overcome by proper transducer installation. Many Humminbird® products have
a Noise Filter menu setting that allows the user to clear the screen of noise that is
difficult to eliminate.