Quick guide to undestand GANDD:
1. Review "Uniform Methodology for the Identification, Assesment and Reporting of Air Navigation Deficiencies", approved by the Council on 30 November 2001.​
2, Read "Procedures for classifying and addressing 'U' deficiencies in the Air navigation Field", developed in compliance with GREPECAS Decision 14/60, contribute to the application of a Uniform Methodology for the identification, assessment and reporting of deficiencies, as approved by ICAO Council.​