Gmdss : Element 7 - 579/600
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| To ensure effective communications, GMDSS operators should: |
| A) Rely on the equipment calculations of Optimum Usable Frequency. |
| B) Employ the short rules of propagation selection. |
| C) Rely on previous successful communications on the selected frequency band. |
| D) Taken together, both b) and c) are good operational practices. |
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