This standard states the minimum requirements for radiotelex equipment 1) for use on board ships. These requirements include the relevant provisions of the Radio Regulations and the performance standards for shipborne MF/HF radio installations for Narrow Band Direct Printing (NBDP) equipment operating in the Global Maritime Distress and Safety System (GMDSS), and of the performance standards Res. A 569 (14) and Res. A 613 (15) as adopted by the International Maritime Organization (IMO).