Definition
A class designation for a non-directional radio beacon (NDB) of medium power, typically with a service range of approximately 50 nautical miles. The 'H' stands for 'Homing' and identifies one of several NDB power classes (compass locator, MH, H, and HH) used in the FAA's classification of these ground-based navigation aids.
Plain English
An 'H' is a medium-strength ground radio station that aircraft can navigate toward using an onboard receiver. The signal can usually be picked up from about 50 miles away.
Context Anchor
Seen in FAA notice abbreviations, airport information, and older radio navigation references when a non-directional beacon is being identified.
Derivation
The letter 'H' comes from 'Homing,' reflecting the original purpose of these beacons: pilots could 'home in' on the station by flying toward the signal. The class letters (H, MH, HH) indicate relative power and range, with more letters meaning higher power.
Why Pilots Care
Provides a reliable navigation reference for homing and instrument approaches when GPS or VOR is unavailable or as a backup.
Analogy
Think of it like a lighthouse that sends its signal out in every direction. The beacon does not point at you; your equipment helps you tell where the beacon is.
Intuition Check
Non-directional does not mean the pilot gets no direction from it. It means the beacon broadcasts in all directions, and the aircraft equipment is what helps show the direction to the beacon.
Example Sentence 1
The approach chart identified the outer fix as an 'H' class NDB, so the pilot expected reliable reception from about 50 miles out.
Example Sentence 2
During the preflight briefing the instructor noted that the approach used the non-directional homing beacon marked H.