🔍 Key Concepts

• GMDSS (Global Maritime Distress and Safety System) role and components • Difference between position-fixing systems and communication/distress alerting systems • Which equipment actually calculates latitude and longitude versus which equipment transmits distress signals

💭 Think About

• Ask yourself: which of these options is primarily designed to determine a vessel’s exact geographic coordinates, rather than to send or relay distress alerts? • Consider which systems are satellite communication or search-and-rescue networks and which one is an onboard receiver providing continuous navigation data to other equipment. • Think about what device usually feeds position data to the ship’s radio console, DSC controller, and distress alerting units.

✅ Before You Answer

• Identify which option is specifically a position-fixing / navigation system rather than a distress beacon or satellite service. • Confirm in your GMDSS notes which device is listed as the usual source of position input for DSC and distress alerts. • Make sure you are not confusing a satellite search-and-rescue system or terminal type with the equipment that actually computes the vessel’s position.