🔍 Key Concepts

• GMDSS sea areas (A1, A2, A3, A4) and what equipment each area requires • The role of VHF DSC (Digital Selective Calling) versus MF/HF DSC frequencies • Which channels/frequencies are designated for continuous DSC watchkeeping on SOLAS vessels

💭 Think About

• First, match each answer choice to the sea area it is typically associated with (VHF, MF, or HF). Which one clearly relates to Area A1? • Consider what Sea Area A1 is defined by: coverage of what kind of coastal station, using what band and system? Which option fits that definition? • Separate in your mind: which frequencies/channels are for DSC watch and which are for voice distress, safety, and calling. Which of these choices is primarily a DSC channel for the correct band?

✅ Before You Answer

• Know the formal definition of Sea Area A1 under GMDSS (what type of station and what band). • Identify which option uses a VHF channel and which use MF/HF DSC distress frequencies. • Verify which channel is specifically designated for DSC, not just voice calling (for example, compare Ch-16 vs Ch-70).