Gmdss : Element 7 - 158/600
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| Which of the following statements concerning DSC equipment is true? |
| A) The GMDSS Radio Operator is responsible for properly selecting HF DSC guard channels. |
| B) All equipment must be type accepted. |
| C) The vessel's navigational position must be updated, either automatically or manually, no less often that every four (4) hours. |
| D) All of the above |
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