How many NAV frequencies can the RMU store?

The RMU, or Radio Management Unit, is specifically designed to facilitate efficient management of radio frequencies in an aircraft. One of its key features is the ability to store various frequencies for quick access during flight operations.

In this context, the correct answer states that the RMU can store 10 NAV frequencies. This is significant as it allows flight crews to have a versatile range of navigational aids readily available without needing to manually input frequencies during operations, thereby enhancing efficiency and promoting safety.

The design and functionality of the RMU focus on the need for flexibility and rapid response to changing navigational requirements. Having 10 stored frequencies allows crews to switch between them as necessary, which is particularly useful during complex flight operations where multiple navigational aids are in use. This capability supports both standard operations and situations requiring quick changes based on air traffic or alterations in flight plans.