GMDSS Radio Operator's License (DO) (Element 1 & 7)
GMDSS Radio Operator/Maintainer License (DB) (Elements 1, 3, 7 & 9)

Element 7: GMDSS Radio Operating Practices. GMDSS radio operating procedures and practices sufficient to show detailed practical knowledge of the operation of all GMDSS sub-systems and equipment. The exam consists of questions from the following categories: general information, narrow-band direct-printing, INMARSAT, NAVTEX, digital selective calling, and survival craft. To pass, an examinee must correctly answer at least at least 75 out of 100 questions.