Reference views are useful to get an overall view of where you are in the whole scene and to quickly move the camera to a location in a large model. This functionality is available in a 3D workspace.
There are two types of reference views available in Autodesk Navisworks:
The reference views show a fixed view of the model. By default, the section view shows the view from the front of the model and the plan view shows a top view of the model.
Reference views are displayed inside the dockable windows. A triangular marker represents your current viewpoint. This marker moves as you navigate, showing the direction of your view. The marker may also be dragged by holding the left mouse button over it and dragging to move the camera in the Scene View.