Subelement C: DSC & Alpha-Numeric ID Systems— Topic :
Question 14C2
Element 7R (GMDSS-RO)How many digits are in the MID (Maritime Identification Digits)?
Explanation
The Maritime Identification Digits (MID) is a three-digit number used to identify the country of origin for a vessel or shore station within maritime radio communications. It forms the initial part of a longer Maritime Mobile Service Identity (MMSI) number.
An MMSI is a unique 9-digit number that identifies a ship, ship's earth station, or coast station. The first three digits of any MMSI always represent the MID, indicating the country that licensed the station. For example, MIDs for the United States begin with 338, 366, 367, 368, or 369. Therefore, option A is correct.
Options C (9 digits) refers to the full length of an MMSI, not just the MID. Options B (7 digits) and D (10 digits) are not standard lengths for either an MID or an MMSI.
Related Questions
13B6 Which statement concerning radio log archival by the station licensee is false?14C1 What is the MID?14C3 What does the MID (Maritime Identification Digits) signify?14C4 Which of the following numbers indicates a U.S. flag ship station?14C5 Which of the following MMSI numbers indicates a U.S. flag ship station?