Running Object Snaps

An object snap mode specifies a snap point at an exact location on an
object. OSNAP specifies running object snap modes, which remain active
until you turn them off.
1. Choose   Tools, Drafting Settings...
                     or
2. Type    DDOSNAP at the command prompt
    Command: DDOSNAP
                    or
3. Click   OSNAP on the Status Bar.
4. Right Click the Object Snap TAB.
5. Choose an object snap to turn ON/OFF from the dialog box.