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DSC — Digital Selective Calling — is a feature built into every modern VHF marine radio. Most boaters have it enabled but do not fully understand what it does. It is one of the most important safety features on a recreational vessel.
What DSC does. DSC allows your VHF radio to send a digital distress signal on Channel 70 that includes your vessel’s MMSI number, your GPS position, and the nature of distress — all with a single button press. Coast Guard stations and all DSC-equipped vessels within range receive it instantly.
Why it is better than voice Mayday. A voice Mayday requires you to be coherent enough to speak, know the right procedure, and transmit on the right channel. A DSC distress call is one button. It transmits your exact GPS coordinates automatically. In a real emergency — fire, flooding, man overboard — the DSC button is the most reliable way to get help.
What you need to make it work. Register your vessel with Transport Canada (or your country’s maritime authority) to get an MMSI number. Enter the MMSI into your VHF radio. Connect your VHF radio to your GPS via NMEA 0183 or NMEA 2000 so it always has a current position to transmit. Without a GPS connection, DSC only sends your MMSI — no position data.
Connection to d3kOS. If your VHF radio broadcasts DSC vessel data on NMEA 2000, d3kOS can display nearby DSC contacts on the dashboard alongside AIS traffic.
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