🔍 Key Concepts

• On-scene communications purpose in GMDSS (Global Maritime Distress and Safety System) • Differences between distress alerting channels and working/on-scene channels • Which channels are reserved for DSC (Digital Selective Calling) vs voice communications

💭 Think About

• First, separate which listed channels are mainly used for sending the initial distress alert versus talking to ships and SAR units on scene. • Identify which option(s) are DSC-only channels that do not normally carry voice traffic. • Think about what channel a rescue coordinator would tell all units to "switch to" for coordinating search patterns and rescue efforts after the distress alert has been received.

✅ Before You Answer

• Verify which frequencies (from the options) are officially designated for on-scene communications in the GMDSS framework, not just general calling or distress alerting. • Confirm which channel(s) are used primarily for DSC and are not normally used for voice communication. • Check that you are not confusing distress/calling channels with working/on-scene channels—these are related but have different primary purposes.