Obstacle Departure Procedures (ODP) are preplanned IFR departures designed to provide what primary purpose?

• A. Weather routing
• B. Obstruction clearance via the least onerous route
• C. Timely landing sequences
• D. Emergency diversion options

Answer: (B)

Obstacle Departure Procedures are preplanned IFR departures that guarantee obstacle clearance on the initial part of the climb by providing a specific route from the runway to the en route structure. This route is chosen to give the necessary clearance with the least deviation or complexity from normal departure, hence the “least onerous route.” The idea is to have a safe, predictable path that avoids terrain and obstacles without depending on ATC to vector you through it. They aren’t primarily about weather routing, sequencing for arrival times, or emergency diversion options, though weather and traffic considerations can influence overall flight planning. Following the published path ensures you meet obstacle clearance on the departure, even if ATC vectors you later.