Subelement D: Distress, Urgency & Safety Comms— Topic :
Question 20D2
Element 7R (GMDSS-RO)What is meant by the acronym “EOS" in a DSC message?
Explanation
"EOS" in a Digital Selective Calling (DSC) message stands for **End Of Sequence**.
DSC is a crucial global standard for automatically establishing radio calls, particularly for distress, urgency, and safety communications. Its messages are highly structured, using specific digital codes to convey information like the nature of a distress, position, and the identity of the calling station.
The EOS code serves as a vital control character that definitively marks the conclusion of a DSC message. This allows the receiving DSC equipment to recognize that the entire message has been received, validate its integrity, and then correctly process the information contained within. Without EOS, the receiver wouldn't know when the message was truly complete, leading to potential misinterpretations or truncated data.
Options A ("Error Of Sequence") and D ("Equal Operating Signals") are not recognized terms within DSC protocols. Option B ("End Of Signals"), while conceptually similar, is not the precise terminology used in the international ITU-R M.493 standard that defines DSC message structure.
Related Questions
1A6 GMDSS is required for which of the following?20D1 Which statement is true regarding the receipt and acknowledgement of Distress alerts by ship stations?20D3 What is the proper procedure to be followed upon receipt of a Distress alert transmitted by use of Digital Selective Calling techniques?20D4 What is meant by the acronym “ECC" in a DSC message?20D5 What action should be taken on receipt of a VHF Distress alert?