Arrow
Click to use the default arrow cursor. With the default cursor you can select and manipulate objects on the screen.
Image
If you are currently using one of the tools, such as the Tape Measure for example, clicking the Arrow button will cancel the current tool.
To move overlays around in the sonar view, click the Arrow button, then click and hold the left mouse button on an overlay. Drag it to where you want it then release the mouse button.