Range function
The Range function allows you to specify the maximum theoretical vertical depth covered by the ME70. The range is defined from a selected start range, and down to a value beneath the current bottom depth. The value selected and shown is by default only applied to your active echogram.
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How to open
This function is opened from the Main menu.
Description
The Range setting defines how "deep" you wish the ME70 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 ME70 presentations, use the Echogram dialog box.
You can only do this if you have computer keyboard connected to your Processor Unit. Without a keyboard, select a predefined value. You can also change the value by selecting - and holding - the middle of the button, and move the cursor sideways.
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 ME70 system, type the requested value.
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.