Vessel Velocity views
The Vessel Velocity views display water velocities relative to the vessel. The views display water velocity in fore/aft and port/starboard direction as well as down towards the seafloor. Vessel speed is displayed separately. By default the ADCP views cover the entire screen and display information horizontally.
How to open
Use the ADCP View Settings dialog box to select this view. The ADCP View Settings dialog box is located on the Active menu.
Description
Vessel velocities are estimated from the measured beam velocities. These water velocities includes both the velocity of the vessel itself and the velocity of the water current.
| • | The Vessel Fore Velocity view presents the current velocity added to the vessel velocity in the fore/aft direction of the vessel.
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| • | The Vessel Starboard Velocity view presents the velocity of the water current added to vessel velocity in the starboard/port direction of the vessel.
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| • | The Vessel Down Velocity view presents the velocity of the water current added to the vessels movements in the downward direction towards the bottom.
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| • | The Vessel Speed view displays the speed of the vessel with no direction indicated. Vessel speed is superimposed on the current speed
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Tip
Move the cursor across the view to obtain numerical information from the ADCP presentation. By default, the information is related to the exact position of the cursor.
By default, the vertical axis presents the depth in metres. The horizontal axis is shown with time stamps. Vessel velocity and speed are both measured in m/s or knots.
Details
The colour scale for is bipolar using two colours. It visualises the direction and magnitude of the velocity. Blue colour indicates negative values for velocity. Red colour indicates positive values for velocity.Higher velocities are displayed using a deeper colour. The colour displays direction of the velocity.
ADCP Colour Span is used to set the maximum velocity values (positive and negative). ADCP Colour Span is located on the Active menu.If the velocities displayed is in the range -0.5 m/s to 0.5 m/s, ADCP Colour Span should have the value 0.5 m/s in order to visualise the velocity with the best colour resolution.The maximum value should be set in relationship to the velocities displayed.
Example
A vessel moves forward at 3 m/s. The current velocity is 0.5 m/s in the opposite direction of the movement of the vessel. The Vessel Fore view will display a velocity of -3.5 m/s. The velocity will be displayed in blue colour.
The colour scale for speed is gradient. High speed is displayed using deeper reds and lower speed is displayed using lighter reds.
Tip
Move the cursor across the view to obtain numerical information from the ADCP presentation. By default, the information is related to the exact position of the cursor.