Gmdss : Element 7 - 227/600
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| GMDSS vessels equipped for A2, A3 or A4 must maintain a continuous DSC watch on 2187.5 kHz. |
| A) Only in areas beyond Inmarsat coverage. |
| B) Only outside of areas covered by VHF-DSC. |
| C) When directed to do so by a cognizant rescue authority. |
| D) At all times when underway. |
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