Marine VHF for hobby listeners

If you can see water — or even if you cannot, but you live toward a coast or a major river — marine VHF is one of the most reliable “something is actually transmitting” bands on a scanner. It is also one of the easiest to misuse. This guide is for receive-only hobby listeners, not for anyone keeping a watch on a vessel.

The handful of channels that matter first

Marine VHF around 156–162 MHz is channelised. You do not need all 80+ channels in a codeplug to learn the band.

• Channel 16 — 156.800 MHz — distress and calling. In open water this is the calling frequency. You will hear ships and coast radio setting up a working channel, plus the occasional distress or urgency call. Do not occupy it. Do not transmit on it without the right authority and a very good reason.
• Channel 70 — 156.525 MHz — DSC (Digital Selective Calling). It sounds like data burps, because it is. Useful as a “the radio works” marker; useless as voice.
• AIS — 161.975 and 162.025 MHz (AIS 1 and 2). More data. An SDR with an AIS decoder will plot ships. A handheld will just hiss unless you have a decoder.

Working channels (port operations, ship-to-ship, marina) vary by location. A Solent list is not a Clyde list. We would rather store a named public marker than a rumour about “the fishing fleet on ch 72.”

This is not a GMDSS course

Commercial and recreational vessels use marine VHF under maritime rules, MMSI numbers, and DSC procedures. A hobby scanner does not make you part of that system. Never call a ship “for a radio check” from the sofa. Never replay distress traffic as entertainment on the forum.

If you want to operate marine VHF for real, that is a different qualification and a different radio, installed as a ship station.

What you will actually hear from land

• Coastguard and volunteer lifeboat traffic on public calling/working arrangements (still not yours to interrupt).
• Port and pilotage in busy estuaries — short, operational, often boring, which is what safety radio should sound like.
• Small leisure craft on a sunny Saturday, usually close inshore.
• Almost nothing inland, unless you are near a wide river or a ship canal with activity.

A 2 m amateur colinear will hear marine VHF reasonably; the bands are neighbours. A PMR446 stub will not.

How we catalogue marine rows

The marine pack is a coastal hobby reference: calling, DSC, AIS, and selected public markers members have confirmed. It is not an almanac of every UK port working channel. If you submit a marina channel, say that it is marina working, give the place, and do not attach a private company’s internal talkgroup culture to it.

Notes should help the next listener: “output towards the estuary,” “busy weekend only,” “data only.” They should not include cargo, personal names, or anything that reads like a surveillance log.

Aerials and locations

Marine VHF is still VHF: height and a view of the water win. A loft antenna in Birmingham will not hear the Thames. A handheld on a cliff in Cornwall will. If you are documenting a listing, say which coast you were on.

Salt air eats cheap coax. That is a vessel problem; on land just keep connectors dry.

Related tools

Abbreviations such as DSC and AIS are in our abbreviations list. Lawful-use context is in lawful hobby listening. If your radio shows “channels” rather than MHz, check you are on international marine numbering, not an amateur memory labelled by mistake.

Listen, do not pretend to be a ship, and treat channel 16 with the same respect operators do.