Range function
The range setting defines from how "far" you want to detect echoes. In other words, you specify the horizontal or vertical distance from the vessel to the outer edge of the search area. With a transducer pointing straight down, the range is defined from a selected start range, and down to a value beneath the
current bottom depth.
How to open
This function is opened from the Main menu.
Description
The Range setting defines how "deep" you wish the EK80 system to detect echoes. In other words, this is the vertical distance between the "top" and the "bottom" of the echogram. The Range setting specifies the "bottom" depth, while the Start Range setting specifies 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.
Tip
If you wish to apply the new range setting to all the current echograms of the same type, select Apply to all.
To select which echogram types you wish to see in the display presentations, use the Echogram dialog box.
You can only type a new value if a computer keyboard is connected to your Processor Unit. Without a keyboard, select a predefined value. You can also adjust the setting by clicking the [+] and [−] buttons.
Example
Start Range in a surface-related echogram
In a surface echogram, set the Start Range value to 0 metres. This will make the echogram start from the sea surface (provided that the transducer offset has been defined).
Set Range to the current depth plus 20 metres. The echogram will now show the area from the sea surface and down to 20 metres "below"
the sea bottom. The sea bottom contour is easily detected when the depth changes.
Example
Start Range and Range in bottom-related echogram
In a bottom echogram, set the Start Range value to –5 metres. This will make the echogram start from 5 metres above the sea bottom. Set Range to the 5 metres plus 10 = 15 metres. The echogram will now show the area from 5 metres above the depth, and down to 10 meters
"below" the sea bottom. The sea bottom contour will appear as a flat line.
Details
Range
This setting controls the displayed depth range in the echograms. The start (upper) depth of the echogram is the value defined by the Start Range setting.
Select either side of the button to choose a value. Select the middle of the button to open it. If you have a keyboard connected to the EK80 system, type the requested value.
Auto
By selecting Auto, the EK80 system automatically adjusts the range according to the current depth.
Apply to All
The value selected and shown is by default only applied to your active echogram. If you wish to apply the new range setting to all the current echograms of the same type, select Apply to all.