nonprecision offset
1Instrument approach — Terminal procedures for an ILS approach in the United States. (The disclaimers shown in red in the illustration do not appear on the original approach plate.) For aircraft operating under instrument flight rules (IFR), an instrument approach or… …
2simplified directional facility — A navigational aid (NAVAID) used for nonprecision instrument approaches. The final approach course is similar to that of an ILS (instrument landing system) localizer except that the SDF course may be offset from the runway, generally not more… …
