Maritime broadcast communications net
In telecommunications, a maritime broadcast communications net is a communications net that is used for international distress calling, including international lifeboat, lifecraft, and survival-craft high frequency ; aeronautical emergency very high frequency ; survival ultra high frequency ; international calling and safety very high frequency ; combined scene-of-search-and-rescue; and other similar and related purposes.
Note: Basic international distress calling is performed at either medium frequency or at high frequency.