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3 miles from the ship, a distance closer than is required by Naval Air Training and Operating Procedures Standardization (NATOPS) instrument approach procedures.
In Brisbane, Australia, government sponsored trials demonstrated that RNP instrument approach procedures saved aircraft operators 882,000 pounds of jet fuel a year, even though only 18 percent of the aircraft were capable of flying the procedures.
Instrument Approach Procedures on the large-screen Kindle DX electronic book reader