What is the color of the outer marker (OM)?

The outer marker (OM) is an important visual aid in aviation, especially used in the approach phase of landing. It is designed to inform pilots of their distance from the runway and indicate when they are approaching a critical point during an approach. The correct color for the outer marker is typically blue, which is standardized in aviation regulations as it provides a clear and distinct visual cue for pilots as they prepare for landing.

This blue color helps differentiate it from other markers and signals, such as the inner marker and middle marker, which use different colors to signal their respective distances and statuses. By designating the outer marker with a distinct blue color, pilots can swiftly identify their position and navigate their descent accurately, contributing to overall flight safety.