ICAOICAO Annex 10
ICAO Annex 10 — Aeronautical Telecommunications
Read the official ruleAnnex 10 standardises aeronautical communications, navigation and surveillance (CNS) — radio frequencies and procedures, navaids (VOR, ILS, GNSS), and surveillance systems (radar, ADS-B). It's why a navaid or radio works the same way internationally. *Summary only — consult ICAO.*
This is an original plain-English explanation for training and reference, not legal advice and not for navigation. Always rely on the current official rule linked above. Last reviewed June 2, 2026.