You receive a TELEX with the sender’s I.D....

Question 1 of 27070kRRmylJ8INvU4aJO9gcp

You receive a TELEX with the sender’s I.D. of 433863491. What type of terminal sent this message to your vessel?

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Question 1 of 27070

Q

You receive a TELEX with the sender’s I.D. of 433863491. What type of terminal sent this message to your vessel?

🔍 Key Concepts

• Inmarsat mobile numbers (IMN) structure and what they identify • Difference between a ship earth station telex ID and a land-based TELEX number • Which Inmarsat systems are associated with narrow-band telex/data vs high-speed voice/IP

💭 Think About

• Look at the number 433863491: does it look more like a traditional public TELEX network number or an Inmarsat mobile number assigned to a terminal? • Which Inmarsat system is historically linked to store-and-forward telex-style messaging rather than broadband IP or primarily voice services? • Among the Inmarsat options listed, which ones are mainly used for high-speed data/voice vs simple text/telex communications?

✅ Before You Answer

• Verify which Inmarsat service uses 9-digit Inmarsat Mobile Numbers (IMN) for message addressing • Check which system is commonly associated with shipboard telex via satellite • Confirm which options (if any) are broadband IP/voice terminals, which are less likely to be used as a classic TELEX endpoint