What is the obstacle ratio for marking obstacles?

What is the obstacle ratio for marking obstacles?

• A. 5:1 ratio
• B. 2:1 ratio
• C. 15:1 ratio
• D. 10:1 ratio

Answer: (D)

When marking obstacles, the aim is to make them clearly visible from a distance so trainees can plan and react in time. The ratio used for marking describes how the markers’ presence scales with the obstacle’s characteristics, ensuring consistent detection across different obstacles and distances. A 10:1 ratio provides a practical balance: markers are spaced and scaled enough to stand out without crowding the field with too many cues, giving a reliable lead time to respond. If the marking were tighter (smaller ratio), markers could clutter the approach and distract or confuse; if it were looser (larger ratio), the obstacle might not be seen early enough, compromising safety and performance.

When marking obstacles, the aim is to make them clearly visible from a distance so trainees can plan and react in time. The ratio used for marking describes how the markers’ presence scales with the obstacle’s characteristics, ensuring consistent detection across different obstacles and distances. A 10:1 ratio provides a practical balance: markers are spaced and scaled enough to stand out without crowding the field with too many cues, giving a reliable lead time to respond. If the marking were tighter (smaller ratio), markers could clutter the approach and distract or confuse; if it were looser (larger ratio), the obstacle might not be seen early enough, compromising safety and performance.