MON stands for which in VOR service volumes?

• A. Minimum Operational Network
• B. Minimum Operating Network
• C. Major Operating Network
• D. Monitored Operational Network

Answer: (B)

In VOR service volumes, MON is about the smallest set of VOR facilities that must remain available to provide reliable navigation coverage. The idea is to keep VOR signals usable for IFR routes and procedures even as other stations are decommissioned or downgraded. This minimum, still-functioning network ensures pilots have essential en route and terminal guidance across the airspace, preserving enough coverage and redundancy for safe operations. The wording used in this context emphasizes a functional, ongoing capability—the network must be operational to support navigation—more than just being monitored or simply existing. Among the options, the form that conveys a minimal, functional network dedicated to preserving service best captures how MON is used in planning and discussing VOR coverage. Other choices don’t fit because they imply monitoring, a different kind of network, or don’t express the idea of maintaining a limited but usable set of VORs for navigation.