What does "unmonitored required NAVAIDs" signify for filing an IFR flight plan?

The phrase "unmonitored required NAVAIDs" indicates that pilots must exercise caution when relying on certain navigational aids that are not actively monitored by air traffic control. Specifically, this means that pilots should be aware that ATC is not providing advisories for these navigational aids, which can impact situational awareness during flight.

Additionally, there may be limitations on the availability of weather reports for these NAVAIDs, further complicating navigation and decision-making for pilots. In this context, "unmonitored" means that if the NAVAIDs fail or if there are other issues, pilots will not receive the support or information they typically expect from ATC, necessitating alternative navigational strategies.

Thus, understanding that both weather information and ATC assistance are absent provides crucial context for safe flight planning and execution, making it essential for pilots to have alternative means of navigation and to be self-sufficient when utilizing these unmonitored NAVAIDs.