When picking locations, Rhino's drawing cursor consists of two parts:
| 
                     Cursor  | 
                
                     The cursor is always black and white. 
                          | 
            
| 
                     Marker  | 
                
                     The marker takes on the color of the current layer. 
                          | 
            
If you are in a situation where the cursor is moving away from a specified point, such as when using elevator mode, a tracking line will appear.
            If an object snap is on, the marker will snap to the snap point.