What color is associated with the outer marker beacon?

The outer marker beacon is associated with the color blue. This specific color is used to indicate the location of the outer marker, which is part of the instrument landing system (ILS) approach procedure. The outer marker designates a significant point in the approach, typically indicating that the aircraft is approximately 4 to 7 miles from the runway threshold while on the ILS glide slope.

Understanding the colors associated with navigational aids is crucial for pilots as these visual cues help them make critical decisions during flight, especially during approaches and landings. The blue color of the outer marker contrasts with other colored beacons used in different phases of flight, thus providing clarity in navigation aids for pilots.