Humminbird Matrix 20 - Manual (Page 11)

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NOTE: If the Depth number is flashing, it means that the unit is having trouble locating
the bottom. This usually happens if the water is too deep, the transducer is out of the
water, the boat is moving too fast, or for any other reason that the unit can’t accurately
receive continuous data.
Freeze Frame - Pressing any arrow on the 4-WAY Cursor Control key will freeze the
screen in the Sonar View and a cursor will be displayed on the screen. The cursor
can be positioned on the display using the 4-WAY Cursor Control key to determine
the depth of any sonar return. The RTS™ Window continues to update in Freeze
Frame. In addition, see the effects of menu setting changes with Instant Image
Update. Pressing EXIT will exit Freeze Frame and the display will start to scroll.
Freeze Frame is only available in the Sonar View.
Understanding Sonar History
It is important to understand the significance of the Matrix Fishing System display.
The display does NOT show a literal 3-dimensional representation of what is under
the water. Each vertical band of data received by the control head and plotted on the
display represents something that was detected by a sonar return at a particular
time. As both the boat and the targets (fish) may be moving, the returns are only
showing a particular segment of time when objects were detected, not exactly
where those objects are in relation to other objects shown on the display.
Sonar View
Upper Depth
Range
Sonar History
Window
Depth
Cursor Dialog Box
Temperature
Triplog
Lower Depth
Range
RTS™ Window
Cursor