MSAS provides augmentation information, which improves the accuracy, reliability, and safety of GPS, for aircraft using GPS navigation.

MSAS receives GPS signal at the Ground Monitor Stations and the Monitor & Ranging Stations, checks the operational status of GPS, analyze GPS error and ionospheric delay, and then broadcasts augmentation information through MTSAT (Multi-functional Transport Satellite) from the Master Control Stations.

TESBL manufactured and delivered MSAS under contract with the Civil Aviation Bureau, Ministry of Land, Infrastructure, Transport, and Tourism.

New CNS/ATM systems including MSAS not only improved coverage and accuracy increase air traffic control capacity but also produce the following merits.

  • Increased Safety
  • Direct flight path means less workload for both pilots and controllers resulting in more attention paid to the traffic situation.
  • Increased coverage results in increased use of instrument flight rules.
  • Flexible flight path makes weather deviation easy.
  • Protection of environment
  • Selection of the shortest flight path means fuel savings resulting in a reduction of greenhouse gas emissions.
  • Use of flexible flight path enables noise reduction in noise sensitive areas.