This page provides detailed legal and technical information and links about the two comprehensive ADS-B mandates within U.S. and EU airspaces that will be effective from 2020. Only ADS-B MOPS (Minimum Operational Performance Standard) Version 2 transponders with all required data sets correctly transmitted will be compliant with these mandates. MOPS version 0 or 1 transponders may send certain data subsets as aircraft position and position accuracy, but these will not be accepted as compliant equipment by the authorities. However, third party non aviation certified data providers may opt to use these data, of course, if the accuracy provided is sufficient for their needs.

Other mandates will apply or are in force in less comprehensive airspaces of Canada, Singapore, Hongkong, Australia, North Sea (helicopter operations), and others. These may have other MOPS requirements.

Besides ADS-B transponder mandates there continue to co-exist Mode-S and/or Mode A/C transponder mandates in most regions of the world.

Also a detailed list of mandated and monitored ADS-B broadcast items can be found here. In general those items are monitored by adsb24.com that can be derived from routine messages of ADS-B transponders.

Data items that are transmitted in extraordinary situations only (Ident feature, TCAS RA, etc.) are not monitored. The same applies for items that would require verification by another system (position, altitude, velocity, etc.) or a reliable database (category, length, width). Once a reliable aircraft database is available some items may be monitored in future.

While we try to keep up with the evolving legal base and many regulatory documents dealing with ADS-B we cannot accept any liability for the correctness and completeness of data presented on this page.

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