Cockpit Card - Mayday This Mayday Cockpit card is designed to be displayed near the DSC VHF. An eessential reference card, blank spaces are left free so you can write your boat name, MMSI number and Call Sign using a permanent marker pen. The first part of the card leads the user through the DSC Alert and the second part shows the spoken Mayday procedure. Encapsulated with a heavy duty plastic, making it perfect for cockpit use.