Which of the following is a limitation of onboard weather equipment?

The selection that identifies a limitation of onboard weather equipment focuses on the potential coverage issues along the entire flight route. Onboard weather systems typically rely on sensors and data sources that may not provide comprehensive information for every area the aircraft traverses. This could mean that while there might be accurate and timely data for some regions, other parts of the flight may not be well represented, leading to gaps in situational awareness for pilots.

The other options highlight aspects that are generally considered advantages or features of such equipment. For instance, onboard systems do indeed provide real-time weather data, which enhances the safety and decision-making capabilities of the flight crew. It is also unlikely that these systems deliver high-resolution images; however, they are designed to present useful information on relevant weather conditions rather than complete graphical representations. Moreover, while modern systems strive for reliability, it can never be guaranteed that they will always function without errors. Therefore, the core limitation stems from the coverage aspect, where certain areas may lack data, impacting overall situational awareness.