For those of you that do not know, MCTS (Marine Communications and Traffic Services) is “the Branch of the Canadian Coast Guard that provides communications and vessel traffic services to the sea-going public”.
“MCTS monitors for distress radio signals; provides the communications link between vessels in distress and the JRCC/MRSC; sends safety information; handles public communication; and, regulates the flow of vessel traffic in some areas. MCTS is an important link in the SAR system”.
The above is a quote from the official Canadian government website on Maritime Search and Rescue. (about half-way down the page)