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Quick Disconnect Mount: The Quick Disconnect Mounting system is an exclusive
Humminbird® feature that permits the unit to be easily removed from the mounting base by
pressing a release button, and re-installed by simply snapping it back into place. All cable
connections are made when installing, so that no separate wiring connections are required.
Additionally, the mount offers 90° tilt and 360° swivel capability to adjust the viewing angle
of the unit as you move about the boat.
Real Time Sonar: Real Time Sonar is a Humminbird® technology that delivers ultra-fast sonar
transmitter/receiver operation and results in a more detailed instantaneous view of what is
under the boat. The Real Time Sonar window is a vertical band at the right side of the display that
shows the instantaneous sonar return from the transducer at a particular instant. The RTS®
Window menu option permits the user to adjust the window to show the full sonar signal return,
or just a narrower band that indicates intensity using grayscale. Real Time Sonar relies on very fast
Sonar Update Rate (Ping Speed). See Sonar Update Rate.
Receiver: See Transmitter.
Second Return: The Second Return is a term that describes the appearance of a second sonar
return below the primary sonar return (bottom contour) at exactly twice the true depth. The
second return is caused by the same sonar energy bouncing off the bottom once, rebounding to
the water surface and then traveling back down to the bottom to be reflected again. Second
returns are more common in shallow water and over hard bottoms; it is actually possible to see
a third sonar return under some circumstances. The second return provides useful information to
help determine bottom hardness, as areas with harder bottoms will generally create a second
return. The second return can be used as a guide to set Sensitivity when in shallower water.
Sensitivity: Sensitivity is a user feature that adjusts the sensitivity of the sonar system to show
more or less detail in the water. Higher sensitivities are often preferred, however, when the water
contains debris (silt, storm debris, etc.) and it can be difficult to pick out targets. Conversely, if
sensitivity is set too low, relevant targets may be missed.
SONAR: SONAR is the acronym for SOund and NAvigation Ranging. Sonar technology uses
precision sound bursts transmitted underwater to determine the distance and other attributes
of objects in the water. Distance can be determined because the speed of sound in water is
constant, and the time for the signal to return is measured. Sound also travels very quickly
underwater, making sonar a responsive, cost-effective tool. Sonar is the basic technology behind
all recreational and commercial fishfinding and depthfinding devices.
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.