What does a multi-frequency DSC alert ensure?

A multi-frequency DSC (Digital Selective Calling) alert is designed to ensure that the Rescue Coordination Center (RCC) is notified regardless of propagation conditions. This feature leverages multiple frequencies, which allows the distress signal to be transmitted effectively under various radio propagation conditions.

This capability is crucial in emergencies, as it increases the chances of the RCC receiving the alert, even if one or more frequencies encounter issues due to environmental factors, such as signal blockage or interference. The use of multiple frequencies maximizes the likelihood of getting the distress message through, which can be vital for effective search and rescue operations.

Other options do not capture the essence of what a multi-frequency DSC alert achieves. For instance, local authorities being notified may not encompass the broader goal of guaranteeing RCC communication. Sending signals with lower power compromises distance and reliability, while alerting multiple vessels does not specifically relate to RCC communication, which is the primary focus during a distress situation.