If a false distress alert is sent on MF, what action is required?

The requirement to cancel a false distress alert sent via MF (Medium Frequency) involves making a voice announcement on 2182.0 kHz. This frequency is specifically designated for distress communications and is commonly used for maritime safety. By making a voice announcement on this frequency, the operator ensures that other vessels and maritime authorities are informed of the false alert, thereby preventing unnecessary responses to what was mistakenly sent as a distress signal.

It's important to recognize that making an announcement on 2182.0 kHz is essential for clarity and immediate communication regarding the status of the distress signal. This action helps to maintain safety at sea and reinforces the duty to not only issue but also to retract any distress communications accurately.

Other frequencies mentioned in the options do not align with standard protocols for cancelling a distress alert in the MF band, hence they are not appropriate actions in this scenario. The procedure to cancel a distress alert is well-outlined in regulations to avoid confusion and maintain the integrity of maritime communications.