CARD GMDSS OPERATING GUIDANCE CARD GMDSS Operating Guidance Card (1992 Edition) This useful A4 (297 mm × 210 mm) card provides guidance on the procedures to be followed under the Global Maritime Distress and Safety System (GMDSS) by masters of ships in distress. A tough plastic lamination and strips of double-sided adhesive tape on the back make the card ideal for display on ships’ bridges and other suitable locations. ISBN 978-92-801-14403