What is meant by the term 'Vector SID'?

A 'Vector SID' is a type of Standard Instrument Departure (SID) that is specifically designed for situations where the aircraft requires radar guidance from Air Traffic Control (ATC) during the initial phase of flight after takeoff. This means that, instead of specifying a fixed, published route for pilots to follow solely by instrument navigation, the use of a Vector SID allows ATC to provide real-time navigational instructions via radar. This provides greater flexibility in managing aircraft traffic, especially in busy airspace, and allows ATC to adjust the flight path based on current traffic conditions.

Vector SIDs are particularly valuable in scenarios where direct routing is impractical, enabling ATC to ensure safe separation between multiple aircraft during departures from an airport. This approach enhances safety and efficiency in air traffic management, adapting the aircraft's flight path while still maintaining a level of structure through the SID design.