đ Key Concepts
⢠DSC (Digital Selective Calling) Distress Priority format requirements in GMDSS
⢠What optional information can be INCLUDED in a DSC distress alert (e.g., nature of distress, position, followâon frequency, type of followâup communication)
⢠The difference between voice and narrowâband direct printing (NBDP/TELEX) as followâup methods
đ Think About
⢠Which of the options allows the most COMPLETE, correctly formatted DSC distress alert without contradicting how a single distress call is structured?
⢠In a single DSC distress call, can you specify BOTH nature of distress AND an alternate working frequency, or must you choose one of them? Similarly, what about position versus alternate frequency/emission?
⢠For a DISTRESS alert, is it normally limited to ONLY voice followâup, ONLY TELEX followâup, or can it be set up for either depending on the shipâs equipment and situation?
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Before You Answer
⢠Check what information fields are PERMITTED in a single DSC distress alert: MMSI, position, time, nature of distress, type of subsequent communication, and/or working frequency.
⢠Verify whether the regulations allow either voice or NBDP/TELEX as followâup for a distress alert, or if it must be restricted to only one mode.
⢠Eliminate any choice that wrongly limits followâup communications to only ONE mode if the GMDSS standards clearly allow more than one.