Although all SBAS are regional systems, the need to establish adequate co-operation/coordination among SBAS providers is commonly recognized so that their implementation becomes more effective and part of a seamless world-wide navigation system. ICAO SARPs Annex 10 and Aviation Standards support interoperability among SBAS service providers by:

  1. Seamless transition between SBAS Service Areas.

- Evaluating transitions between SBAS and RAIM along with transitions between two SBAS and between SBAS and GBAS.

  1. Common interpretation of Standards amongst SBAS Developers.

- Established a work plan for development of a definition document to support a dual-frequency, multi- constellation user.

  1. Currently Limited Global Coverage.

- Global coverage to be expanded with addition of GAGAN and SDCM. 

- Availability of worldwide LPV-200 service expected with addition of a second frequency, extended networks and additional GNSS constellations.

  1. Continued support to legacy single frequency users by ensuring backwards compatibility.

    SBAS IWG objectives established to support technical interoperability and cooperation: 

    Objective 1: Harmonize SBAS modernization plans. 

    Objective 2: Forum for discussion on SBAS standards. 

    Objective 3: Harmonize technical improvements for operation and user feedback. 

    Objective 4: Research and development cooperation on key SBAS technologies. 

    Objective 5: Support joint SBAS promotion.

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