The Adverse Weather Aerial Delivery System (AWADS) is a navigational system installed in some U.S. Air Force C-130 aircraft. It enables the aircraft to fly to a DZ during reduced visibility, and provides flexibility to the Airborne commander in the accomplishment of all Airborne missions. It is effective to use AWADS in large Joint operations, tactical reinforcements, and specialized missions. Instrument meteorological conditions (IMC) is an aviation flight category that describes weather conditions requiring pilots to fly primarily by reference to instruments, and under instrument flight rules, rather than by outside visual references under visual flight rules.