How to start metal detecting with a known coin

What you need to know

A loan detector and its manual

Ask the owner to show you power, volume, a beginner mode and sensitivity. Follow that model's instructions for calibration and settings.

A coin, card and notebook

Use a modern coin you own on a plain nonmetallic card. Bring a notebook to record settings and the signal; leave the ground undisturbed.

Permission to detect here

Get the landowner's agreement and check local restrictions and protected-site status before switching on. Public access alone is not permission.

Clear space and practical shoes

Choose familiar, level ground with room for a gentle sweep, away from people and objects the coil could strike.

Start with a coin you own, placed visibly on a card. Compare its signal with the same patch after removing it. No digging or unknown finds.

Confirm the place and set up

Confirm permission and local restrictions before switching on. In England, detector use on a scheduled monument needs Historic England’s consent as well as landowner permission; exclude these sites. Rules elsewhere differ. If permission or a loan is unresolved, ask a club about a supervised introduction and fees.

Have the owner demonstrate the controls. Use the model’s manual to choose a beginner mode that responds to your coin and set volume and sensitivity. Adjust the shaft for comfort. Keep the coil level and close to the ground without striking it. Move other metal away from the test patch.

Compare the coin with clear ground

Sweep a small patch from side to side before placing the coin. If it gives target responses, choose another permitted patch. Put the coin flat on the visible card. Sweep across it several times in both directions at a steady height and pace, keeping the coil level at each end. Note any repeated tone or displayed target ID.

Remove the card and coin, sweep the patch again, then replace them and repeat. If the tone returns only with the coin, you have a comparison. Collect both items. For erratic responses, move away from interference and follow the manual’s noise or sensitivity instructions. Ask the owner if the coin stays silent.

Log the model, mode, sensitivity, coin and whether the tone or ID repeated. A target ID cannot establish an unknown object’s identity, age or value. Before searching for unknowns, ask a local club or heritage authority about lawful places, recovery and reporting. GOV.UK explains treasure reporting in England and Wales; Scotland and Northern Ireland have different rules.