Post all hazards not less than how far on either side of the course line for safety?

The correct answer indicates that posting all hazards should be done not less than 10 nautical miles on either side of the course line for safety. This practice is important in Terrain Flight Operations because it establishes a buffer zone that allows pilots to be aware of potential hazards while navigating. The 10 nautical mile posting ensures that any obstacles or dangers, such as terrain features, tall structures, or other aircraft, are adequately accounted for, thus enhancing overall flight safety and situational awareness.

Maintaining this distance enables pilots to make necessary adjustments to their flight path in advance, thereby reducing the risk of accidents and ensuring a safer flying environment. By having this clear distance that hazards need to be posted, it provides pilots with the information they need to operate safely within the airspace, especially in terrain-sensitive environments.