What action does the term "MONITOR" refer to in radio communication?

The term "MONITOR" in radio communication specifically refers to the action of listening on a frequency. This involves consistently or periodically checking a radio channel for any transmissions, messages, or important announcements. Monitoring does not require an immediate response to communications, but rather is a passive action aimed at staying informed about ongoing communications on that frequency.

Listening effectively allows operators to gather necessary information, understand traffic on the channel, and be prepared to respond if needed. This practice is vital for maintaining situational awareness, especially in environments where communications may be crucial, such as in aeronautical operations.