Subelement C: DSC & Alpha-Numeric ID Systems— Topic :
Question 14C4
Element 7R (GMDSS-RO)Which of the following numbers indicates a U.S. flag ship station?
Explanation
Maritime Mobile Service Identity (MMSI) numbers are unique 9-digit identifiers used in digital selective calling (DSC), AIS, and other automated systems. For ship stations, the first three digits, known as the Maritime Identification Digits (MID), designate the country of registration.
U.S. flag ship stations are assigned MMSI numbers where the MID begins with 338, 366, 367, 368, or 369.
Option C, 338426791, begins with 338, correctly identifying it as a U.S. flag ship station. Option B, 243537672, begins with 243, which is the MID for Spain. Options A (036627934) and D (003382315) begin with 0 or 00, indicating an international group call or a coast station, not an individual ship station. Therefore, only C represents a U.S. flag ship.
Related Questions
14C2 How many digits are in the MID (Maritime Identification Digits)?14C3 What does the MID (Maritime Identification Digits) signify?14C5 Which of the following MMSI numbers indicates a U.S. flag ship station?14C6 Which of the following numbers indicates a ship station MMSI?15C1 A DSC call is received from a station with a MMSI number of 003669991. What type of station made the call?