Subelement C: DSC & Alpha-Numeric ID Systems— Topic :
Question 15C3
Element 7R (GMDSS-RO)A MMSI 030346239 indicates what?
Explanation
A nine-digit MMSI (Maritime Mobile Service Identity) beginning with a single "0" (e.g., 0MIDXXXXX) indicates a Group Call MMSI. This special type of MMSI allows a single digital selective calling (DSC) transmission to be addressed to multiple ships simultaneously, useful for fleets, convoys, or organizations.
A single ship station MMSI typically begins with a Mobile Identity Digit (MID) from 2-9 (e.g., 366xxxxxx for a US ship). A coast station MMSI starts with two zeros (00MIDXXXX). While Inmarsat-C terminals have IDs, their structure doesn't align with this specific MMSI format.
Related Questions
15C1 A DSC call is received from a station with a MMSI number of 003669991. What type of station made the call?15C2 A valid MMSI number for a DSC call to a specific group of vessels is:15C4 Which of the following statements concerning MMSI is true?15C5 Which of the following statements concerning MMSI is false?15C6 Which of the following statements concerning MMSI is true?