Definition
Ground-based or space-based equipment that transmits signals pilots use to determine position, track a course, or fly an approach. Common examples include VORs, NDBs, DMEs, ILS components, and GPS satellites, along with their associated airborne receivers.
Plain English
The radio and satellite stations that send out signals so pilots can figure out where they are and stay on course.
Context Anchor
Seen in instrument flight clearances when a route is described using named navigation points, stations, or systems.
Derivation
Navigation comes from older words meaning to guide or direct a ship. Facility comes from a word meaning something that makes an action easier. Together, the phrase points to equipment or systems that make finding and following a route possible.
Why Pilots Care
They are the reference points used to issue and follow IFR clearances when visual navigation is not possible.
Intuition Check
Do not read “facilities” here as buildings or airport restrooms. In this context, it means navigation systems, stations, or equipment that help define and fly a route.
Example Sentence 1
Before the flight, the pilot checked NOTAMs to confirm all navigation facilities along the route were in service.
Example Sentence 2
The pilot selected the next navigation facility on the chart to stay on the assigned airway.