Global Maritime Distress and Safety System (GMDSS) - How Ships in Distress Call for Help
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How To Send A MAYDAY!
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O VERDADEIRO motivo pelo qual os repetidores estão mortos!
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A Antena HF Invisível
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Weak Signal Propagation Reporter (WSPR) - What it is and how to build your own WSPR transmitter
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APRS — Practical Explanation and Usage
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GMDSS - Introduction and exam details (PART 1)
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VLOG#10 - HOW TO CONDUCT WEEKLY AND MONTHLY EQUIPMENT TEST OF GMDSS | HOW TO BE A THIRD MATE SERIES
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