What should stations do upon hearing the urgency signal?

When a station hears the urgency signal, the appropriate response is to continue listening for at least three minutes. This period allows for any critical information that may follow the urgency signal to be communicated by the station that initiated the signal. The urgency signal is an indication that there is a situation that requires immediate attention, but it does not necessarily call for an immediate response or interruption of ongoing communications.

By listening for this duration, stations can ensure they are fully aware of any developments or instructions. Responding too quickly or attempting to communicate at that moment could interfere with the ongoing communication and potentially hinder the resolution of the urgent situation.

The other options, while they may seem like possible reactions, do not prioritize the critical need to maintain awareness of any forthcoming messages or updates related to the urgency signal. Thus, maintaining active listening for at least three minutes is essential to effectively respond to the urgency situation.