2. HORIZONTAL MODE
2-30
Fish histogram
The fish histogram shows, in graph form, signal strength distribution for the school(s)
of fish marked with an estimate mark on the horizontal/slant displays. The histogram
display for each of those displays will be different since the calculation method is dif-
ferent. This data appears only when an estimate mark is active. When two estimate
marks are active, histograms are displayed one on top of the other as below.
The horizontal axis shows signal strength in 16 colors, and the vertical axis shows the
concentration of a school of fish inside the fish estimate mark. For the fish estimate
mark inscribed on the horizontal display (or slant display) the graph shows the aver-
age movement in five scans, to increase accuracy.
Note: The histogram display is redrawn five transmissions after a fish estimate mark
is erased and another mark of the same number is entered soon after.
2.16.2 How to compare with the circle cursor
You can get an estimate of the volume of two schools of fish with the circle cursor as
follows:
1. Push the scrollwheel to show the [Select Mark] window.
Fish estimate
mark source
Fish estimate
mark no.
Estimate mark 1 or estimate
mark 2 displayed
Both estimate marks displayed
2 1
2
Scan1
Scan2
Fish estimate
mark source
Scan1
Selected mark name
Scan mode in which mark can be entered
Circle cursor
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