What technique should be used to find the point directly below the aircraft during jump run?

Using the technique of observing two lines from the horizon to find their intersection is effective for pinpointing the drop zone directly below the aircraft during jump run. This method relies on establishing visual references on the ground and aligning them with your position in the aircraft. By drawing a mental line from your vantage point in the aircraft to identifiable features on the horizon, you can accurately determine where the vertical point below you is located.

This technique is particularly useful as it incorporates the pilot's perspective and helps in visualizing the altitude and distance from the landing area. It allows parachutists to anticipate their position concerning the landing area and adjust their jump run accordingly, resulting in a more precise exit point, especially in windy conditions.

Understanding wind direction and speed, while important for jump planning, is a subsequent consideration after establishing where to jump. Using a GPS can provide an exact location but may not be as effective in dynamic situations where visual references are necessary. Counting seconds to estimate distance can give a rough idea but lacks the precision of directly aligning visual markers from the horizon to guide the parachutist accurately. Therefore, observing the horizon and calculating the intersection of lines provides the most reliable way to identify the drop zone during the jump run.