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Beach detecting: the rules, the tides and the salt

A guide by Rob · Law last checked 25 September 2026

A beach looks like the one place you can detect without asking anyone. It isn’t quite, and the sea has two more ways to catch you out: the tide, and what salt water does to a detector. I learned the second one the expensive way: sea spray worked its way into my X‑Terra 70’s circuitry and killed it.

1. Whose beach is it?

Every beach belongs to someone, the foreshore included (Portable Antiquities Scheme, 2023). What matters is which part of the beach you’re on:

Much of the foreshore in England, Wales and Northern Ireland belongs to The Crown Estate, which publishes a map showing exactly which stretches it owns (The Crown Estate, no date). Check it before you go.

2. Crown Estate foreshore: no permission needed, but read the small print

You don’t need formal consent to detect on Crown Estate foreshore. You get what they call a “permissive right”, but it comes with conditions most detectorists have never read (The Crown Estate, 2024). The ones that matter:

It doesn’t cover the seabed or riverbeds. The Thames foreshore needs its own permit from the Port of London Authority. Stretches inside a Site of Special Scientific Interest or a Marine Conservation Zone may be restricted, and councils can ban detecting with byelaws, so check with the local authority too (The Crown Estate, 2024).

3. Everywhere else on the coast

4. Wreck: the law most beach detectorists don’t know

Anything that has come from a ship, aircraft or hovercraft (part of the vessel, its cargo or its equipment) is wreck material, and if you pick it up you must report it to the Receiver of Wreck within 28 days. Not doing so can mean a fine of up to £2,500 (GOV.UK, no date). On Crown Estate foreshore the deadline is 14 days (The Crown Estate, 2024). Reporting it gives the owner the chance to have it back, and you may be entitled to a salvage award for recovering it (GOV.UK, no date).

5. The modern stuff: rings, phones and wallets

Most of what a beach gives up is modern: coins, keys, rings, the odd phone. Modern jewellery isn’t Treasure, but it isn’t automatically yours either. Keeping something is only honest if you believe “the person to whom the property belongs cannot be discovered by taking reasonable steps” (Theft Act 1968, s. 2(1)(c)). A worn pound coin, fine. An engraved ring, a phone or a wallet with a name in it: the owner can probably be found, so hand it to the police. And on Crown Estate foreshore, anything of value has to be reported to the Crown Estate and the police anyway (see section 2).

6. The tide and other dangers

7. Salt water and your detector

This is the one that cost me a machine.

Know what’s waterproof on yours, and what isn’t. On many detectors the coil is waterproof but the control box, where the electronics live, is not. Spray, a dropped detector or a wet hand on the controls can be enough. Some modern machines are fully waterproof: my X‑Terra Elite is rated IP68, waterproof to 5 metres (Minelab, no date). Headphones are a separate question, so check yours.

My X‑Terra 70’s control box had a splashproof cover that kept the odd rain shower off the controls, but it wasn’t waterproof. At some point during a spell of beach detecting, sea spray got into the controls through the battery compartment and reached the electrics without my knowing. After a long break before my next session, the detector was dead: it wouldn’t turn on. It wasn’t the batteries, and the battery terminals weren’t corroded, so I took the control box apart. The ribbon cable between the circuit board and the screen had partly corroded away. Days of searching for parts showed the unit was obsolete, and the only fix was a replacement control box. After a brief moment of despair, opportunity knocked: a retirement present of a new detector was due. This time I wanted one that was completely waterproof, and the X‑Terra Elite fitted the bill.

The lesson: splashproof isn’t waterproof. If your control box isn’t sealed, keep it away from spray, check the battery compartment after every beach trip, and don’t wait for the machine to die before you look.

Rinse everything in fresh water after every beach session, and dry it before you pack it away. Salt left to dry forms crystals that corrode contacts and joints. My routine with the Elite:

Wet sand talks back. Salty wet sand conducts electricity, so the detector “hears” the beach itself as a mass of noise and false signals, much as it does on mineralised inland soil. Most modern machines have a beach mode to deal with it, and multi-frequency detectors cope far better than single-frequency ones. If your machine still chatters, lower the sensitivity.

The X‑Terra Elite has two Beach modes. The first is for dry and damp sand. The second is for wet and submerged sand, meaning literally in the sea. With plenty of North Wales beaches to search, the first is my default.

8. Where to search

Go where the people went. Modern finds and coins turn up most where visitor footfall has been heaviest, and a good detectorist looks for those areas before searching blindly.

Look for where the sea has stripped the sand. Where the tide has taken away the fine sand and left gravel behind, finds can be concentrated.

Take a bag for the rubbish. I find a lot of rubbish on the beach, and probably dig up as much of it as anything else. I always take it away and dispose of it responsibly, recycling whatever I can. It gives me great satisfaction to leave a beach with less rubbish on it than when I arrived. Plastic concerns me most, because it breaks down into microplastics that end up in the food chain.

The short version

  1. Find out whose beach it is. On Crown Estate foreshore, read the conditions.
  2. National Trust beaches: don’t.
  3. Surface only on Crown Estate foreshore; fill every hole.
  4. Report Treasure (14 days), wreck (28 days, or 14 on Crown Estate foreshore), and valuables on Crown Estate foreshore (14 days, to the Crown Estate and the police).
  5. Engraved ring or a phone? Hand it in.
  6. Check the tide before you go, carry a charged phone, and call 999 for the Coastguard.
  7. Know what on your detector is waterproof, and rinse it in fresh water every time.
  8. Take your rubbish home, and anyone else’s you dig up.

References

This is a plain-English guide, not legal advice. Rules on a particular beach can change; check with the landowner and the local authority before you go.

Before you dig

Finding things is the easy part. These are the people who make a find count for something.

Scotland, Ireland and Northern Ireland

Those four are for England and Wales, where the Portable Antiquities Scheme records finds and the Treasure Act decides what must be reported.

Scotland runs its own system, and every find is reportable there — not only treasure. Treasure Trove Unit ›

The Republic of Ireland is different again, and severely so. Searching for archaeological objects without the Minister’s written consent is a criminal offence carrying fines or imprisonment, and the definition is broad enough to cover coins, buttons and buckles of almost any age. Do not assume British rules travel with you. The law, from the National Museum ›

Northern Ireland is stricter still. The Treasure Act applies and finds go to National Museums NI within fourteen days, but any searching that involves digging — metal detecting expressly included — needs a licence, and licences are only granted for archaeological projects. National Museums NI ›

This site covers discoveries from all over the world, and so does the variation in the law — from a recording scheme that thanks you, to a criminal offence. Wherever you are searching, find out what applies there before you go, not after.

Found something? What to do next › · Buying or selling a find? What is legal to sell, and where ›