How can you identify the highest obstacle on an approach plate?

To identify the highest obstacle on an approach plate, one can look for the conspicuous arrow that points directly toward the obstacle. This feature is specifically designed to draw the pilot's attention, ensuring they are aware of significant hazards that may affect the approach and landing phases of flight. The presence of an arrow provides a clear visual indication, making it easier for pilots to locate the highest obstacle and take necessary precautions.

While other options may involve common elements found on approach plates, such as color highlights or legends, those features are not universally used for indicating the highest obstacle, making the arrow a distinctive and effective marking for that purpose.