Which channel is designated for safety calls in maritime communication?

Channel 16 is recognized as the international distress, safety, and calling frequency in maritime communication. This channel is primarily used for emergency calls and hailing other vessels, making it crucial for safety at sea. All vessels are required to monitor Channel 16 while at sea, allowing them to quickly respond to distress signals or call for assistance if needed. The significance of Channel 16 lies in its universal use, ensuring that mariners around the world are tuned in to the same frequency in case of emergencies, thereby enhancing safety and communication on the water.

Channel 70 is used for digital selective calling, which is a different function focused on sending specific messages rather than general safety communication. Channel 22A is typically used for port operations and communications. Channel 9 is an alternate hailing frequency, but it doesn't have the same priority or recognition for distress calls as Channel 16 does. Therefore, Channel 16 stands out clearly as the designated channel for safety calls.