Gmdss : Element 7 - 478/600
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| How are paired NBDP frequencies normally used? |
| A) These are normally used for FEC communications with coast radio stations. |
| B) These are normally used for ARQ communications with coast radio stations. |
| C) These are normally used only for Distress communications to limit channel interference. |
| D) These are normally used for DSC communications with coast radio stations. |
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