🔍 Key Concepts

• Inmarsat-C terminal login/log-out procedures and how network routing works • How shore-to-ship messages and charges are handled when a terminal is registered as "logged in" • The role of MSI (Maritime Safety Information) vs commercial traffic in Inmarsat-C operations

💭 Think About

• Think about what happens in the Inmarsat system when a terminal is still shown as active (logged in) at a given ocean region LES, but in reality the ship has moved out of coverage or the terminal is switched off. • Consider which type of traffic (safety broadcasts vs individual addressed messages) is most affected by an incorrect log-out: operational safety information or individually billed communications. • Ask yourself: who pays and who is affected if messages keep getting routed to a terminal that is no longer really available?

✅ Before You Answer

• Verify which answer choice mentions charges or costs associated with mis-routed traffic. • Check which option confuses the normal function of MSI broadcasts, which are usually sent on a scheduled basis regardless of your individual terminal’s login status. • Eliminate any option that suggests the Network Coordination Station (NCS) always protects you from operator error in logging in/out.