🔍 Key Concepts
• GMDSS (Global Maritime Distress and Safety System) identifiers used for ships and coastal stations
• How ships are uniquely identified in digital selective calling (DSC) systems
• The meaning of the letters in the acronym MID within a maritime communications context
💭 Think About
• Which option best fits an identification code tied specifically to a maritime radio/calling system, rather than a cell phone system?
• Think about how a ships MMSI (Maritime Mobile Service Identity) number starts. What does the first part of that number represent?
• Ask yourself: which choice sounds like an official ITU/IMO term used in ship radio documentation?
✅ Before You Answer
• Confirm which option clearly refers to maritime services, not general mobile or insurance terms
• Recall that MID is associated with the first three digits of an MMSI number indicating the vessels country/administration
• Eliminate any options that sound like telecommunications or insurance jargon unrelated to ship radio identification