4 Controlling the scale in the compass rose presentation
The Maximum Speed setting controls the scale in the "compass rose" presentation. This is the maximum speed setting for the velocities presented in the ADCP information pane. Adapting the maximum speed range to the maximum velocity value provides a better visualisation of the velocity and the changes
in the velocity.
Context
Horizontal water velocities are shown in a 360-degrees presentation resembling a compass rose. Your vessel is located in the centre of the presentation. Speed ranges are shown with dotted circles. Each measurement of the water current velocity is presented as a vector drawn as an arrow. The length of the arrow indicates the velocity of the water. The tip of the arrow indicates the direction.
The current velocity can be broken down into components in three dimensions. Displaying the horizontal and vertical component of the current velocity provides a visualisation of the displacement of the
current in these directions. This is useful in order to estimate the relative current velocity in the cardinal directions or relative to the vessel orientation,
as well as to estimate the current velocity in the up/downward direction.
Note
This is a visual enhancement. The choice you make has no effect on the overall performance of the EK80 system.
Procedure
| 1 | Open the ADCP page.
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| 2 | Select an appropriate value for the Maximum Speed. Select Auto if you want the EK80 system to provide automatic scaling.
Velocity can be measured in different units. Choose the unit of measurement on the Units page.
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| 3 | Select Apply to save your choice. |
| 4 | Select OK to close the dialog box. |