Plain English Meaning

Talking to air traffic controllers by voice using a long-range radio that works over oceans and remote areas where normal aircraft radios can't reach.

Full Definition

Voice communication conducted over High Frequency (HF) radio, typically in the 3–30 MHz band. Used for long-range air-to-ground communication where VHF radio coverage is unavailable, such as over oceans, polar regions, and remote continental areas.

Context Anchor

Seen in procedure notes or equipment requirements, especially for departures or in remote areas where ordinary short-range radio may not be reliable.