What are the two types of Standard Instrument Departures (SIDs)?

The correct answer identifies the two primary types of Standard Instrument Departures (SIDs) as Pilot Navigational SIDs and Vector SIDs.

Pilot Navigational SIDs are designed to guide aircraft along a predetermined path using navigation aids. These SIDs provide specific waypoints and routes that pilots can rely on to safely navigate from the departure airport to the en-route structure. This type of SID often requires pilots to maintain their own navigation using onboard instruments.

Vector SIDs, on the other hand, involve air traffic controllers providing vectors, or specific headings, for aircraft to follow after takeoff. This allows for more flexibility in routing, as controllers can adapt to traffic conditions and provide immediate guidance, helping to manage the flow of air traffic in busy airspace.

The other options do not accurately represent the classifications of SIDs. Obstacle Avoidance SIDs pertain more to performance and safety considerations but do not serve as a recognized category akin to Pilot Navigational or Vector SIDs. Additionally, terms like Direct Route SIDs and Alternative Path SIDs are not standard classifications used in ATC terminology for departures. Finally, Standard Approach SIDs and Controlled Approach SIDs pertain to arrivals and approaches rather than departures. Thus, the distinction of SIDs being