A vessel certified for service in Sea Area...

🔍 Key Concepts

• GMDSS Sea Areas definitions, especially what equipment and watchkeeping are required in Sea Area A-2 • The traditional distress and calling frequencies in the MF band for radiotelephony vs digital selective calling (DSC) • The difference between older voice distress frequencies and newer DSC distress alerting frequencies

💭 Think About

• Think about what kind of distress alerting system is mandatory in Sea Area A-2 and which frequency that system uses in the MF band • Ask yourself which of these answer choices looks like a DSC frequency rather than a simple voice (radiotelephone) frequency • Consider whether Sea Area A-2 relies mainly on VHF-only, satellite-only, or MF (medium frequency) systems for distress alerts

✅ Before You Answer

• Verify the official MF DSC distress frequency used for GMDSS distress alerts in Sea Area A-2 • Confirm which of the listed frequencies is associated with voice distress calling and which with digital selective calling (DSC) • Double-check that the frequency you choose matches the MF band DSC distress and safety watch requirement for A-2 ships

A vessel certified for service in Sea Area A-2 is required to maintain watch on:

2174.5 kHz

2182.0 kHz

2738.0 kHz

2187 .5 kHz