What would a pilot primarily refer to for navigational signal purposes?

A pilot would primarily refer to a VOR, which stands for VHF Omni-directional Range, for navigational signal purposes. The VOR is a type of radio navigation system that provides aircraft with a bearing to a specific station, allowing pilots to determine their position and navigate accurately. This is crucial for en route navigation, especially in areas where visual references may be limited.

The VOR system consists of ground stations that emit signals, and by tuning into these frequencies, pilots can receive directional guidance. It is a fundamental tool for both instrument flight and transitioning between airports, making it essential for maintaining safe and efficient flight operations.

In contrast, TAF (Terminal Aerodrome Forecast) and METAR (Meteorological Aerodrome Report) are focused on weather conditions and forecasts rather than navigation. An Aircraft Performance Report pertains to the performance characteristics of the aircraft and is used for flight planning rather than for navigational signal purposes. Therefore, the VOR is the primary reference for navigation among the given choices.