What is one notable disadvantage of relying solely on electronic navigation systems?

Relying solely on electronic navigation systems has a significant disadvantage in that these systems can be vulnerable to electronic failures or malfunctions. This vulnerability can arise from various factors, including software glitches, hardware malfunctions, or even environmental conditions such as electromagnetic interference. When electronic systems fail, there is a risk of losing critical navigational information, which can lead to safety hazards, especially in situations where precise navigation is required, such as in busy shipping lanes or near land.

This potential failure underscores the importance of maintaining a backup navigation method, such as traditional charts or dead reckoning, to ensure reliability. In contrast, the other options address concerns that may vary based on the type of navigation system in use or the specific context of operation, which could be mitigated through good practices, maintenance, or integration with other systems.