Non-precision Approaches and Systems
- Localizer
- VOR – VHF Omnidirectional Range
- NDB – Non-Directional Beacon with complementary Automatic Direction Finder (ADF) installed on board
- LDA – Localizer Type Directional Aid
- SDF – Simplified Directional Facility
- GPS – Global Positioning System (with or without vertical navigation capability, which usually requires extra precision typically afforded by using WAAS, EGNOS, or other signal correction systems)
- TACAN – Tactical Air Navigation
- SRA – Surveillance Radar Approach (known in some countries as an ASR approach)
- ASR – Airport Surveillance Radar (military designation for SRA)
Read more about this topic: Instrument Approach
Famous quotes containing the words approaches and/or systems:
“I should say that the most prominent scientific men of our country, and perhaps of this age, are either serving the arts and not pure science, or are performing faithful but quite subordinate labors in particular departments. They make no steady and systematic approaches to the central fact.... There is wanting constant and accurate observation with enough of theory to direct and discipline it. But, above all, there is wanting genius.”
—Henry David Thoreau (1817–1862)
“I am beginning to suspect all elaborate and special systems of education. They seem to me to be built up on the supposition that every child is a kind of idiot who must be taught to think.”
—Anne Sullivan (1866–1936)