Which position is related to high-pitched dots during a flight?

The position related to high-pitched dots during a flight is known as the back course marker. In the context of an instrument landing system (ILS), a back course marker is an indication on the approach that helps pilots locate the localizer's position during a back course approach. When a pilot is approaching the back course path, audio alerts, which may include high-pitched tones, seem to indicate proximity to the marker, aiding with situational awareness.

The other choices refer to different critical aspects of the approach and landing phase. The final approach fix denotes the point in an instrument approach where the aircraft is established on the final approach course, often marked by a decision altitude or a specific glide path. Threshold crossing height is the height above the runway threshold at which an aircraft should cross during landing stabilization. Decision altitude refers to the minimum altitude for an approach where a pilot must decide to continue the approach or execute a missed approach. While all these points are essential for safe instrument approaches, they do not specifically relate to the high-pitched tone associated with proximity to the back course marker.