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Marine VHF radio operation, DSC, AIS, and MMSI registration are covered in a single tutorial aimed at recreational boaters. Basic VHF protocol calls for hailing on channel 16, then moving to a working channel — Tim recommends channel 68 — and keeping transmissions short because all nearby stations hear every word.Watch DSC (Digital Selective Calling) requires registering an MMSI number, programming it into a DSC-equipped radio, and ideally connecting the radio to a GPS or chartplotter so a single distress button press broadcasts the vessel's identity and exact position to the Coast Guard's Rescue 21 direction-finding network.1:49 Without GPS integration, the distress signal still transmits MMSI data but no coordinates.3:09 AIS, often built into higher-end VHF radios, broadcasts and receives vessel identity, position, course, speed, and destination at roughly 40 nautical miles; satellite AIS extends that globally.4:18 DSC also supports direct digital calls to a specific MMSI, functioning like a pager for a buddy boat.3:44 Tim recounts towing a disabled vessel with a dead handheld radio for an hour at six knots until the Coast Guard arrived, illustrating how a Coast Guard relay on powerful equipment can reach vessels that cannot be heard locally.7:51 Connecting a VHF to GPS and registering an MMSI are the minimum upgrades that meaningfully improve rescue response.

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