Final answer:
The airspace to be protected beyond navigational and signal range typically has a buffer that provides an air defense perimeter, with an estimated radius of 30 nautical miles for confirmed or possible SAM sites.
Step-by-step explanation:
The airspace to be protected along off-airway tracks beyond navigational and signal range typically requires a buffer on each side of the track. This buffer is designed to ensure safety and security, particularly in relation to air defense considerations. For instance, an effective air defense perimeter might consist of an estimated radius of 30 nautical miles around a confirmed SAM site or a possible SAM site. Such measures are important to safeguard against potential threats to both military and civilian aircraft outside of the reliable coverage of navigation aids and radar signals.