Minimum safe altitude warning
Minimum safe altitude warning (MSAW) is an automated warning system for air traffic controllers (ATCO). It is a ground-based safety net intended to warn the controller about increased risk of controlled flight into terrain accidents by generating, in a timely manner, an alert of aircraft proximity to terrain or obstacles.
ICAO Doc 4444 requires that radar systems should provide for the display of safety-related alerts including the presentation of minimum safe altitude warning. It is worth mentioning that ICAO Doc 4444 does not provide a definition of the term MSAW. Instead the term MSAW is ambiguously used in ATC community to identify such warnings as well as for data processing systems providing the alert function.
- "EUROCONTROL Specification for Minimum Safe Altitude Warning" (PDF). 0.9. Eurocontrol. 19 May 2009. Retrieved 2010-05-24.
- Rules of the Air and Air Traffic Services. ICAO. Doc 4444-RAC/501.