What are the 4 types of DSC messages?

What are the 4 types of DSC messages?

• A. All Ships, Individual, Geographic, Group
• B. All Ships, Individual
• C. Geographic, Group
• D. All Ships, Geographic

Answer: (A)

DSC messages are addressed using four distinct methods that determine who will hear the call. All Ships broadcasts reach every DSC-equipped station within range, making it a wide-area alert or announcement. Individual targets a single MMSI, so only that vessel processes the call. Geographic targets all stations within a defined geographic area, allowing reach to ships in a specific region without listing them all. Group targets a defined group of MMSIs, such as a fleet or a coordination group, so everyone in that group receives the message. These four modes—broadcast to all, one-to-one, area-based, and group-based—together cover the common ways to direct DSC communications. The other options omit one or more of these addressing modes, so they don’t represent the complete set.

DSC messages are addressed using four distinct methods that determine who will hear the call. All Ships broadcasts reach every DSC-equipped station within range, making it a wide-area alert or announcement. Individual targets a single MMSI, so only that vessel processes the call. Geographic targets all stations within a defined geographic area, allowing reach to ships in a specific region without listing them all. Group targets a defined group of MMSIs, such as a fleet or a coordination group, so everyone in that group receives the message. These four modes—broadcast to all, one-to-one, area-based, and group-based—together cover the common ways to direct DSC communications. The other options omit one or more of these addressing modes, so they don’t represent the complete set.