Question 43 LB01 - Lifeboat Operator

The Correct Answer is C **Why option C is correct:** Emergency Position Indicating Radio Beacons (EPIRBs) are designed to transmit a distress signal—specifically a unique coded identifier and, in modern versions, location data—to search and rescue authorities via the satellite system (like COSPAS-SARSAT). Once activated, whether manually or automatically (e.g., when submerged), the primary function is to continuously transmit this signal (typically on 406 MHz) to maximize the chances of detection and allow SAR authorities to home in on the signal (using the continuous 121.5 MHz homing signal, though 406 MHz is also used for location determination via Doppler shift or integrated GPS data). This continuous transmission is essential for both identification (via the coded MMSI) and precise position determination for rescue. **Why the other options are incorrect:** * **A) The coded signal identifies the nature of the distress situation.** The coded signal (the digital message burst, primarily transmitted on 406 MHz) carries crucial information, including the vessel's unique identification (MMSI) and, often, its last known GPS coordinates. However, it *does not* include detailed information about the *nature* of the distress (e.g., fire, flooding, medical emergency). That detailed information must be relayed through follow-on communications once contact is established. * **B) The coded signal only identifies the vessel's name and port of registry.** This is too narrow and inaccurate. The coded signal identifies the vessel primarily through its Maritime Mobile Service Identity (MMSI) number. While the MMSI is linked to the vessel's name and registration in the distress database, the direct coded transmission typically includes the MMSI and position data. It does not solely transmit the textual name and port; the key piece of data is the machine-readable MMSI. * **D) If the GMDSS Radio Operator does not program the EPIRB, it will transmit default information such as the follow-on communications frequency and mode.** EPIRBs must be properly registered and programmed with the vessel's unique MMSI before installation. An unprogrammed EPIRB cannot transmit useful distress information (it might send a test signal or a default serial number, depending on the manufacturer, but not the vessel's identity). Furthermore, the primary function of the EPIRB is location and identification; it does not typically transmit follow-on communication frequencies or modes, which are standard GMDSS procedures (like using VHF Ch 16/70).