Which of the following is a technical requirement for RNP operations?

Onboard performance monitoring and alerting is indeed a key technical requirement for Required Navigation Performance (RNP) operations. RNP involves a specific level of accuracy, integrity, availability, and functionality that must be achieved during a flight. This requirement necessitates that the aircraft is equipped with systems that continuously monitor its navigation performance. Not only does this ensure compliance with the performance standards of RNP, but it also enhances safety by enabling real-time alerts if the aircraft's performance is deteriorating or not meeting the required navigation specifications. Such monitoring is essential for maintaining precise navigation and achieving safe operations within designated airspace.

In contrast, the other choices, while relevant to different aspects of aviation operations, do not specifically align with the technical requirements defined for RNP operations. The availability of landing guidance systems, naval integration systems, and extended hold capabilities are important for various flight operations but do not directly address the fundamental monitoring and alerting needed for RNP compliance.