Definition
ICAO Annex 10 is the international standards document covering aeronautical telecommunications, including radio navigation aids, communication systems, surveillance, and data link services used in civil aviation worldwide. It is published by the International Civil Aviation Organization and sets the technical specifications and performance requirements that member states agree to apply to navigation and communication equipment, including GPS and other satellite-based systems.
Plain English
It is the global rulebook that says how aviation radios, navigation aids, and satellite navigation systems must work so that aircraft can operate safely between countries.
Context Anchor
Seen in instrument flying discussions about GPS, satellite navigation accuracy, and the standards behind approved navigation systems.
Derivation
ICAO stands for the International Civil Aviation Organization, a United Nations agency formed in 1944 to standardize international air travel. An 'annex' is an attached document that adds detail to a main agreement. Annex 10 is the tenth such document attached to the founding Chicago Convention, and it deals specifically with aeronautical telecommunications.
Why Pilots Care
The standards in Annex 10 directly affect GPS accuracy, integrity monitoring, and the removal of Selective Availability, all of which influence instrument approach minimums and navigation reliability.
Intuition Check
Do not read “Annex 10” as a location, building, or cockpit component. Here it means a numbered international standards document used to define aviation navigation and communication requirements.
Example Sentence 1
The GPS receiver meets the signal performance standards laid out in ICAO Annex 10.
Example Sentence 2
Flight planning software uses ICAO Annex 10 specifications to confirm that satellite navigation aids meet international performance requirements.