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Sonar Echo Enhancement: Sonar Echo Enhancement is a Humminbird® feature that
describes the high degree of sonar sensitivity achieved through a combination of
transmitter/receiver and software algorithms. The result of Sonar Echo Enhancement is
to display virtually everything in the water that is of interest to the angler, including bait
fish, game fish, thermoclines, weed beds, subtle structure, and more.
Sonar Update Rate: Sonar Update Rate is the number of times per second that the
transmitter/receiver sends and receives sonar signals. A very fast sonar update rate collects
more information and provides a more detailed image of the bottom, fish and structure.
Many Humminbird® units operate at up to 40 times per second when in single frequency
operation. Due to the limitation of the speed of sound in water, the update rate begins to
slow as depth increases to deeper than 50 feet. In very shallow water (less than 10 feet),
however, update rates as much as 60 times per second can be achieved.
Speed: Speed is the rate at which the boat moves through the water. Boat speed can be
measured as Speed Over Ground or Speed Through Water. Speed Over Ground is
provided by GPS, and is the measurement of the boats progress across a given distance.
Speed Through Water is provided by a speed paddlewheel, and is the measurement of
the flow past the boat, which may vary depending on current speed and direction.
Speed Through Water is most critical for anglers using downriggers, as it impacts the
running depth of the down riggers. Speed Over Ground is optimal for navigation, as
accurate destination times can be derived from this measurement. Humminbird®
products allow for input and display of both sources.
Structure: Structure is a general term for objects on the bottom that present a
discontinuity and are a likely attractor for fish. This includes bottom contour features
(drop-offs, humps, and holes), standing structure (stumps, timbers, brush 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® is a Humminbird® feature that describes the traditional
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, saltwater environments have significantly greater surface clutter than
freshwater due to continuous wind and wave action that causes aeration at the surface.
The Surface Clutter menu provides manual control to bias the default settings under
extreme conditions.