Choosing Range; Start Range Values In A Surface Related Echogram - Simrad ES80 Reference Manual

Simrad ES80 Reference Manual
Choosing
Range
echogram
A Surface echogram is mainly used when you wish to look at the entire water column
starting from the sea surface and down to the bottom. In a Surface echogram, the start
depth of the echogram is defined by the positive
this start depth and down is defined by the
Context
The setting defines how "deep" you wish the ES80 to detect echoes. In other
Range
words, this is the vertical distance between the "top" and the "bottom" of the echogram.
The setting specifies the "bottom" depth, while the
Range
the "top" depth.
The range you specify applies to the currently selected echogram. It is identified with a
thick border.Several echogram types are available.
In a Surface echogram, the
echogram shall start. This is normally chosen to be a few meters below the sea surface.
The value is then used to define the vertical extension of the echogram. The
Range
may be set to Auto, but for scientific purposes a fixed range is recommended. The
Range
Auto setting allows the ES80 to automatically determine the depth range based on the
bottom detection.
Example
in a surface related echogram
Start Range
In a surface echogram, set the
make the echogram start from the sea surface (provided that the transducer
offset has been defined). Set
echogram will now show the area from the sea surface and down to 20
meters "below" the bottom. The bottom contour is easily detected when
the depth changes.
Procedure
1 Click in any echogram view to make it "active".
The setting you choose will only be valid for the currently "active" echogram. The
"active" echogram view is identified with a thicker border.
2 Observe the
Main
Its default location is on the right side of the ES80 presentation.
3 Locate the
Start Range
4 Choose a positive value for
preferred depth under the sea surface.
94
and
Start Range
Range
value is used to determine from which depth the
Start Range
Start Range
to the current depth plus 20 meters. The
Range
menu.
function.
Start Range
values in a surface related
depth value. The range from
Start Range
value.
Start Range
value to 0 meters. This will
to place the top of the echogram at the
setting specifies
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