A vessel with an 18-hour ETA to the Panama...

🔍 Key Concepts

• Inmarsat ocean regions (AOR-W, AOR-E, POR, IOR) and which one covers the Western Atlantic/Caribbean/Panama area • The difference between satellite coverage limitations and shore earth station (LES) location • What an equipment fault would look like compared to sailing out of a satellite’s footprint

💭 Think About

• On a voyage from Miami toward Panama, which Inmarsat ocean region are you in for almost the entire trip? Think about the Western Atlantic and Caribbean coverage map. • Does Inmarsat-C coverage depend mainly on a specific land earth station location (like Southbury) or on the satellite’s ocean region footprint? • If you were still inside the proper satellite coverage area, what kind of problem would most likely explain a total loss of communication ability?

✅ Before You Answer

• Verify which Inmarsat ocean region serves Miami–Caribbean–Panama (AOR-W vs AOR-E). • Check whether Southbury LES is tied to a specific satellite region and if a ship near Panama would be outside that satellite’s footprint. • Confirm whether normal Inmarsat-C operation would continue within coverage unless there is an onboard equipment or antenna fault.

A vessel with an 18-hour ETA to the Panama Canal on a voyage from Miami loses the ability to communicate via Inmarsat-C. The most likely cause is?

The vessel has sailed beyond the coverage area of the Southbury Land Earth Station.

The vessel has sailed beyond the coverage area of the Eastern Atlantic satellite.

The vessel has sailed beyond the coverage area of the Western Atlantic satellite.

An equipment fault resulting in a loss of signal from the satellite.

🔍 Key Concepts

💭 Think About

✅ Before You Answer