These documents are published and maintained up-to-date by the ICAO Regional Office. The material in these documents is intended for guidance only. It is not intended to replace relevant national instructions or explanatory material. Nothing in these documents should be taken as contradicting or conflicting with the relevant ICAO SARPs, procedures or other guidance issued by ICAO. The regional guidance documents are reviewed from time to time by APANPIRG and its contributing bodies and updates are published after approval by APANPIRG.