How to Use 3D Compass ? - CATIA V5 - CATIALOG

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What Can You Do With the 3D Compass?
The 3D compass lets you:

Manipulate viewpoints using the mouse and compass: this is just another way of panning and rotating all objects in the document at the same time.
Move and rotate non-constrained objects using the mouse and compass .

Moving objects in this context means physically moving them so as to redefine their spatial coordinates with respect to the absolute axis system in a document. Moving must not be confused with panning an object, which simply modifies the viewpoint from which you look at an object: the position of the object in the document remains the same.
Move and rotate non-constrained objects using the Edit... contextual command.
Lock the compass orientation.
Snap the compass automatically onto a selected object.
Set the plane in which you move objects parallel to the screen.
switch the privileged plane to the XZ or YZ planes of the compass.
Use the privileged plane as a working plane in applications such as the FreeStyle Shaper application, for example, when manipulating control point manipulators on planar patches and curves.
If you are also using the Assembly Design application, which provides a number of advanced positioning tools, consider the 3D compass as a preliminary tool for positioning components in space prior to fine positioning of those components within the assembly.

If you are using a space mouse, you can also manipulate the 3D compass when it is in the scene, otherwise the space mouse lets you manipulate the viewpoint.