Gmdss : Element 7 - 4/600
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| GMDSS is primarily a system based on? |
| A) Ship-to-ship Distress communications using MF or HF radiotelephony. |
| B) VHF digital selective calling from ship to shore. |
| C) Distress, Urgency and safety communications carried out by the use of narrow-band direct printing telegraphy. |
| D) The linking of search and rescue authorities ashore with shipping in the immediate vicinity of a ship in Distress or in need of assistance. |
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