Selected beam view
The Selected beam information field displays more detailed information regarding a selected beam. It displays the selected beam, the target strength compensation, which is a projection of the selected beam, and the depth position of the target for the current ping.
How to open
The Selected beam information field is located in the upper left side of the Calibration dialog box.
You select the beam to be displayed in one of three ways.
•  In the Target Position field:
Click on any of the echoes displayed in the field
•  In the Target Strength field:
Click on any of the echoes displayed in the field
•  In the Numerical View field:
Click on any of the rows in the TS-Data representing echoes (targets) displayed in the table.
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A Target Position
B Target Strength Compensation
C Target depth representation
Description
The Selected beam information field provides yet another way to further investigate the target strength. Click anywhere in the Selected beam information field on the left side and a projection will be defined. This projection is detailed further in the Target Strength Compensation information field.The Selected Beam information field ha two representations of the selected beam.
Target Position field
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The Target Position shows all the individual echoes being imported into the calibration program.All echoes are placed inside a circle to reflect their locations in the beam. The echoes are compensated for their positions within the beam, so that echoes from the outer edge appear with the same echo strength as those in the middle of the beam.
The red circle represents the shape of the beam and also the one-way 3 dB beam compensation limit. The same red circle appears in the Beam Mode view representing the selected beam in relation to the other beams in the beam mode. The red, filled circle indicates the last ping target strength positions, and helps monitoring the movement of the target within the selected beam. By placing the cursor inside the view a small label shows the alongship and athwartship angles. By clicking in a position within the selected beam in Target Position, you change the projection displayed in the Target Strength Compensation field. Target circles within a distance of a quarter of the beam width is identified by blue rings. The size of this field is designed to allow the maximum beam compensation (6 dB) to fit within this area.
Target depth representation
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The right side of the field shows the calibration layer that is automatically created once the calibration starts. The representation shows the vertical position of the target for the current ping. It is shown as a red filled circle along a vertical axis. The horizontal lines indicate the defined layer limits for target to be accepted. If the targets fall outside these limits, adjust them in the Setup dialog box. The space above and below the lines make it easy to study the target movement when it is outside the distance limits you have specified. A tooltip is added to display the depth at the cursor position in meter.
Target Strength Compensation
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The Target Strength Compensation information field shows a collection of compensated target strength (TS) in a selected projection in the selected beam. The projection is created in the Selected Beam information field. The vertical axis has a fixed 6 dB range, while the midpoint is determined by the global average TS value for the selected beam. The tool tip shows the beam compensated target strength value at the cursor’s current location.