European Regional Monitoring Agency

The European agency for RVSM monitoring.

Status of EUROCONTROL Height Monitoring Units - updated on 09/12/2019

All three HMU sites (GENEVA, LINZ and NATTENHEIM) are operational, no planned outages.

Due to the annual EUROCONTROL shutdown for non-operational staff, the status of the HMU systems will not be monitored from 14thDecember 2019 until 6th January 2020. Operators are advised not to conduct dedicated height monitoring flights during this period.

The European Regional Monitoring Agency (EUR RMA) is responsible for monitoring and supporting aircraft operations in European Reduced Vertical Separation Minima (RVSM) airspace.

The individual responsibilities include:

  • verifying operator compliance with RVSM approval requirements;
  • monitoring aircraft height keeping performance; and
  • conducting airspace safety assessments as required by the ICAO Regional Planning Group.

Operators can contact the RMA via our contact us form to learn about the latest aircraft approvals data, HMU operational status, to submit a Prior Permission Required (PPR), or to ask general questions.


The EUR RMA maintains a database of all operators and aircraft that have been issued an approval to operate with a 1,000 ft vertical separation in RVSM airspace, by one of the States accredited to it.

All civilian aircraft intending to operate in designated RVSM airspace are required to be approved by their Competent Authority.


All operators of aircraft approved to fly with a 1,000 ft. vertical separation in RVSM airspace are required to participate in the global RVSM height monitoring programme.

Operators can be monitored through various means and in any region.

EUROCONTROL operates 3 fixed, ground based Height Monitoring Units (HMU) to support monitoring in European airspace.

The three European Height Monitoring Systems are deployed at the following locations:

  • Geneva in Switzerland - 46°21’49”N….005°55’34”E (near GVA VOR);
  • Linz in Austria - 48°12’08”N....014°17’35”E (near LNZ VOR);
  • Nattenheim in Germany - 49°56’45”N….006°33’25”E (near NTM VOR; please note that PPR is required – See the ‘contact us’ for the telephone numbers of Maastricht and Karlsruhe UAC Supervisors who can provide more information).

The coverage of each HMU has a radius of 45 NM.

These systems are fully automatic and designed to operate 24 hours a day, 365 days of the year,  however, the operator is advised to confirm the serviceability of the HMUs before conducting a dedicated height monitoring flight.

Any aircraft transmitting a Mode A code, or ICAO 24-bit aircraft identifier, flying between FL 290 and FL 410 within the operational coverage area of the HMUs will be detected by the HMU systems.

To ensure the accuracy of the result, it is necessary for the aircraft to fly straight and level for a minimum of five minutes within the coverage area defined above.

In accordance with AIP ENR 1.3-1, as published by the German Authorities on 28th February 2019, aircraft operators are required to submit a PPR at least three (3) hours in advance if they intend to fly an aircraft over the Nattenheim HMU specifically for RVSM monitoring purposes. This advance notification will help ATC ensure the aircraft can be operated in straight and level flight in the busy and complex nature of the airspace over Nattenheim and thereby contribute to an accurate height monitoring measurement. Please use the contact telephone numbers for the Maastricht and Karlsruhe UAC Supervisors for details of how to submit a PPR.

Providing the flight produced a successful height monitoring result, confirmation will be available approximately 2 weeks after the flight.

For operators registered or approved within the EUR RVSM region or States accredited to the North Atlantic RVSM Region Central Monitoring Agency, a confirmation will be posted here, only if a valid RVSM approval is listed in the EUR RMA approvals database for the aircraft/operator.

For operators registered or approved in other RVSM regions, the confirmation will be sent to the RMA with oversight responsibility for that region of origin.

If it is not feasible for an operator to fly over an HMU for a height monitoring result. An alternative method is to commission a GPS Monitoring Unit (GMU) to be carried on the flight by an authorised technician. GMU operations are conducted by COLLINS AEROSPACE and there is a charge for the service. To arrange a GMU flight, please contact COLLINS AEROSPACE’s GMU team.

Monitoring results

State authorities and operators can check their RVSM approvals and the date of their last successful height performance measurement on the EUR RMA Monitoring Results page. 

Please note that:

  • The EUR RMA does not provide height monitoring results directly to the operators.
  • The queries provide only RVSM approved aircraft, which are registered by states or operators from states accredited to the EURRMA only.
  • The data presented includes only results from the European monitoring programme captured within the last 2 years.
  • For monitoring results from the UK Strumble HMU please contact UK NATS at 


The EASA reference document on RVSM is their Certification Specification and Acceptable Means of Compliance for CS-ACNS

The following ICAO documents, available for purchase on the ICAO website, are pertinent to RVSM:

  • ICAO Doc 4444 - Procedures for Air Traffic Management 
  • ICAO Annex 2 - Rules of the Air
  • ICAO Annex 6 - Operation of aircraft
  • ICAO Annex 11 - Air Traffic Services
  • ICAO Doc 7030 - Regional supplementary procedures
  • ICAO Doc 9937 - Manual of Operating Procedures and Practices for Regional Monitoring Agencies
  • ICAO Doc 9574 - Manual on Implementation of 1000ft VSM between FL290 and FL410 incl.

They are available for purchase on the ICAO website.

State and military aircraft

Due to differences in technical system architecture, some military aircraft have difficulty in complying with RVSM specifications. However, within European RVSM airspace, non-RVSM approved State aircraft operating as General Air Traffic (GAT) may be provided with a minimum vertical separation of 600 m (2000f.t) instead of 300 m (1000 ft.) from all other IFR aircraft, on the condition that appropriate entries are made in fields 8, 10 and 18 of the flight plan (an M in item 8, no W in item 10 and ‘STS/NONRVSM’in item 18).

Military authorities must be aware that any deviation from the initial aircraft type certificate – through a Supplemental Type Certificate for example – will necessitate an RVSM compliance check for the new design. Some States have a regulator for military/State aircraft requiring the same compliance, training, maintenance, approval oversight as its civilian counterpart.

State aircraft with RVSM approval, and with a W recorded in item 10 of the flight plan, can operate in designated RVSM airspace with 1000 ft. separation from other IFR aircraft. To help ensure the safe and efficient operations of State and military aircraft in an RVSM environment, guidance can be provided to military users, which takes into account the specific nature of their needs.

For further information on the operation of State aircraft in designated RVSM airspace, please consult our Guidance Material for the Certification and Operation of State Aircraft.

States and designated RMAs

Each state is attributed to a Regional Monitoring Agency (RMA). A list of States and their designated RMA can be found in ICAO Doc 9937.

The following websites provide links to other RMAs: