What is the maximum number of UHF frequencies that can be stored in the RMU memory?

The maximum number of UHF frequencies that can be stored in the RMU (Radio Management Unit) memory is 20. This is designed to facilitate quick access to frequently used frequencies during flight operations, enhancing situational awareness and communication capabilities. The RMU efficiently manages these frequency selections, allowing pilots to streamline their radio communications without requiring manual tuning for every frequency change. The choice of 20 reflects a balance between operational utility and memory constraints, ensuring that pilots have immediate access to a significant set of frequencies while maintaining a user-friendly interface.