Simplified Directional Facility.html
 
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Simplified Directional Facility or SDF is similar to a Localizer, although is not as precise. The SDF signal is fixed at either 6 or 12 degrees, as necessary maximum flyability and optimum course quality.

The SDF course may or may not be aligned with the runway because its antenna is sometimes offset from the runway centerline.

Usable off-course indications are limited to 35 degrees either side of the course centerline.

List of Current SDF Approaches in the United States

The following 14 SDF approaches in five states are currently published in the United States (currently only 10 are available):

See also

References
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