Definition
The category headings used to group the different ground-based and space-based navigation aids that pilots use for instrument flight. The main types include the nondirectional radio beacon (NDB), VHF omnidirectional range (VOR), distance measuring equipment (DME), tactical air navigation (TACAN), VORTAC, instrument landing system (ILS), marker beacons, and global positioning system (GPS). Each type provides a different kind of navigational information, such as bearing, distance, course guidance, or position.
Plain English
It's the family of navigation tools pilots use to find their way and fly approaches by instruments. Different types do different jobs — some give you a direction to a station, some give you distance, and some guide you down to the runway.
Context Anchor
Seen in instrument training when learning which navigation system a route, procedure, or cockpit display is based on.
Derivation
NAVAID is short for 'navigational aid.' 'Aid' comes from the Latin adiutare, meaning 'to help.' A NAVAID is literally a 'navigation helper' — a ground or satellite system that helps a pilot know where they are and where they're going.
Why Pilots Care
Knowing the types allows pilots to select the appropriate navigation method based on equipment available, weather, and route requirements.
Intuition Check
Do not assume all NAVAIDs are the same kind of equipment. Some are ground-based stations, some are satellite-based systems, and each type gives the pilot different navigation information.
Example Sentence 1
The chapter opens with an overview of the types of NAVAIDs a pilot will use during instrument flight.
Example Sentence 2
Understanding the types of NAVAIDs helps in choosing between VOR and GPS for a particular approach.