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The Pilots Desk
ICAOICAO Annex 4

ICAO Annex 4 — Aeronautical Charts

Read the official rule

Annex 4 specifies the aeronautical charts states must produce and their symbology — from enroute and approach charts to airport and terrain charts — so a pilot can read a chart from any country. *Summary only — consult ICAO and your charting authority.*

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.