In the SailQuiz app · 12 modules · 590+ questions
Quiz-based marine radio theory. Learn VHF operation, channels, distress, urgency and safety procedures, Digital Selective Calling (DSC), GMDSS, licensing, and practical radio procedures with clear explanations and exam-style scenarios.
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Pick a module, take a short quiz, then read the explanations and review the questions you missed.
Quiz scores help you choose what to study next. They do not certify competence or predict an exam result.
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Sailors preparing for an SRC/VHF radio certificate exam or refreshing correct distress, urgency, and routine radio procedures.
Supplementary SRC/GMDSS theory practice. Channel use and licensing depend on jurisdiction; use your local authority’s guidance and radio manual. This is not an approved SRC course or assessment.
Try these before you download. Pick an answer, then reveal the explanation — every one of the 590+ questions in the app is explained the same way.
Answer: C. Channel 16
Channel 16 (156.8 MHz) is the international distress, safety, and calling channel. Routine traffic then moves to a working channel.
Answer: B. Grave and imminent danger requiring immediate assistance
MAYDAY indicates grave and imminent danger requiring immediate assistance. PAN-PAN is an urgency signal concerning the safety of a vessel or person when distress criteria are not met. Choose the signal from the actual circumstances, not merely the type of equipment failure.
Answer: A. A nine-digit identity number programmed into your DSC radio
The Maritime Mobile Service Identity identifies a station in DSC transmissions, including distress alerts. Obtain and programme it through the authorised process for your jurisdiction; ship and operator licensing requirements vary.
Page copy and samples checked on . SailQuiz’s questions are independently authored, not official exam questions. A complete mapping to a certifying body’s syllabus has not been established.
590+ questions with explanations, smart review, and offline study — free to download.
SailQuiz is an independent study aid. It is not affiliated with, endorsed by, accredited by, or otherwise connected to the ASA, US Sailing, the RYA, the USCG, or any other certifying body, and it is not a substitute for their official training or examinations.
