π Key Concepts
β’ MMSI (Maritime Mobile Service Identity) structure for different types of stations
β’ How MID (Maritime Identification Digits) is used in ship, coast, and group MMSIs
β’ Differences between ship station, coast station, and group station MMSI formats
π Think About
β’ For each answer choice, picture what a valid MMSI for that station type would look like and where the MID appears, if at all.
β’ Ask yourself: which station type normally starts with one or more zeros before the MID, and which station type starts directly with the MID?
β’ Consider whether group MMSIs are structured the same way as individual ship or coast station MMSIs, or if they have a distinctive pattern.
β
Before You Answer
β’ Verify in ITU/USCG guidance how a ship station MMSI is formatted, including whether it starts with a zero and how the MID is placed.
β’ Check the required pattern for a coast station MMSI: 9 digits, and where the zeros and MID must appear.
β’ Confirm whether group MMSI numbers begin with a leading zero, with the MID, or follow another distinct pattern before selecting your choice.