When should an "ALL STATIONS" call be made after sending a false alert on 8 MHz?

An "ALL STATIONS" call is the appropriate action to take after sending a false alert on 8 MHz because it serves to notify all maritime stations that the false alert is being canceled and that no further action is required based on that alert. This call helps to avoid confusion and ensures that other vessels and stations are not misled into thinking that there is a genuine distress situation.

The specific frequency of 8291.0 kHz is designated for this purpose, making it the proper channel to relay the cancellation of the false alert to all maritime users within the operational range. By doing so, it also helps maintain safety and efficiency in maritime communications by clearing the airwaves of unnecessary distress signals.

Other actions, such as sending a "MAYDAY" call or an "Urgency" call, do not appropriately address the situation of a false alert and would not effectively inform other maritime entities that the alert has been incorrectly sent. Canceling on all 5 H.F. TELEX channels doesn't specifically reach the intended audience regarding a false distress situation. Therefore, making an "ALL STATIONS" call on the correct frequency is the most effective and proper response.