Technique in the field
How to Research Detecting Sites: Old Maps, Land Use and Who to Ask
Quick answer
Research answers two questions: where did people gather, and who owns that ground now. Old maps, aerial photographs and local histories give the first. The land registry or county recorder gives the second. Protected and designated sites come off the list immediately rather than onto it.
Research is what separates people who find interesting things from people who own interesting machines. The work is genuinely enjoyable and it is mostly done at a table: old maps, aerial photographs, parish and county histories, newspaper archives and the land record. Two afternoons of it will typically produce more than two months of walking.
It is worth being precise about the purpose. Research here is for finding ordinary ground where ordinary people lost ordinary things, and for identifying the person you have to ask before you set foot on it. It is not for locating archaeological sites, and any lead that turns out to be a scheduled monument, a protected site or a battlefield is a lead you drop. That is not squeamishness: those sites are off limits in the great majority of jurisdictions, and the hobby keeps its access by being visibly uninterested in them. Read this alongside the laws and permission guide.
On this page
What are you actually looking for on an old map?
Places where people stopped, worked, gathered or waited. Footpaths that no longer exist, a vanished stile or gate, the site of a fair or a market, an old school, a mill, a crossroads with a name on it, the corner of a field where a hedge used to run. Loss is a function of time spent standing still with things in your pockets, so the target is not buildings so much as the places people congregated around them.
The other high-value feature is change. A field that was pasture on an old survey and is pasture now has been undisturbed for a century, whereas a field that has been ploughed annually has had its finds moved and spread through the plough layer. Both are worth hunting, and they want different technique and different coils, which is the point of the farmland guide.
Which sources tell you what?
Availability varies enormously by country, so treat the left column as the category and find your local equivalent. Most of these are free, and librarians and county archivists are the most underused resource in the hobby.
Historic maps and aerial photographs tell you where people gathered, while the land registry or county recorder tells you who to ask, and the heritage designation register tells you which leads to drop immediately.
| Source | What it tells you | Where it usually lives | Limitations |
|---|---|---|---|
| Historic survey maps | Vanished paths, buildings, boundaries and field names | National mapping agency archives and county libraries | Dates and accuracy vary, and hedges move more than people think |
| Tithe, enclosure and cadastral maps | Old field names and parcel boundaries, often with occupier names | County and national archives | Handwriting and abbreviations take practice to read |
| Historic aerial photography | Ploughed-out features, old tracks, building platforms | Government photo archives and public mapping portals | A visible feature may be a protected site, which ends the lead |
| Current satellite and street imagery | Access, parking, gates, current land use and crops | Public mapping services | Shows the present, so pair it with a historic map |
| Land registry or county recorder | Who legally owns the parcel, and sometimes the occupier | The national or county land record office | Owner and farmer are frequently different people |
| Heritage designation register | Whether the parcel is protected, scheduled or designated | The national or state heritage authority | Designations do not follow fence lines, so check boundaries |
| Local newspaper archives | Fairs, sports grounds, events, camps, fetes and picnics | Library microfilm and digital newspaper archives | Slow to search, but very high value per hour |
| Local and parish histories | Where people worked, gathered and travelled | Local libraries, historical and genealogical societies | Anecdotal, and needs checking against maps |
| Club records and members | Which local ground is permitted and which is closed | Your local detecting club | Local knowledge dates quickly, so confirm it yourself |
This table is about finding ordinary ground and finding the owner. It is not a route to archaeological sites, and any lead that resolves to a protected or scheduled site should be abandoned rather than pursued.
How do you turn a map lead into a permission?
- Fix the parcel on a current map. Translate the historic feature onto present-day boundaries so you know exactly which field or lot you are talking about. Vague requests get vague refusals.
- Check the designation register first. Before anything else, confirm the parcel carries no heritage designation. If it does, the lead is finished. Do not approach the owner for an exception.
- Check the local rules. For public ground, read the municipal or county ordinance for that specific park or open space. Many prohibit detecting outright and the rule is often not posted on site.
- Find the legal owner. Use the land record rather than assumption. The person farming a field is frequently a tenant, and on let land you may need both the owner and the occupier.
- Approach in person, in daylight. A knock at a reasonable hour, with the field named and a written permission form in hand, converts far better than a letter and immeasurably better than a message.
- Put the agreement in writing. Name the parcel and the dates, agree the finds split, state that qualifying finds will be reported, and promise to fill every hole and carry out every piece of trash.
- Record what you were told and when. Rules change and permissions lapse. A dated note of who said yes to what is worth a great deal the day somebody asks you what you are doing.
What does good research look like in practice?
A shortlist rather than a dream site. Ten ordinary parcels within half an hour of home, each with a reason attached and an owner named, will produce far more than one famous-sounding location you will never get onto. Most of the answers will be no, which is normal, and the ones that say yes are the reason the permission guide is the most useful page on this site.
Keep a simple record: parcel, owner, date asked, answer, and any conditions. Note what came out of the ground and where, because a pattern across a field tells you where to concentrate next time far better than memory does. The coin find value calculator is a reasonable way to keep a running tally of what a site is actually returning, which is how you decide whether a permission is worth another season.
What should you never do with research?
Do not use it to identify or target archaeological sites, scheduled monuments or battlefields, and do not publish precise locations of productive historic ground. Published findspots attract people who do not ask permission, sites get stripped, and landowners stop saying yes to everybody including you. This is the convention that the code of conduct exists to protect.
Do not treat a map as permission, either. A footpath on a survey gives you no right to dig, an open gate is not an invitation, and land that looks abandoned still has an owner and sometimes a designation nobody maintains. Research tells you who to ask. Asking is still the next step, every time.
Sources
- National mapping agency historic map archives
- County and state archives, tithe, enclosure and cadastral map collections
- Land registry and county recorder public ownership records
- National and state heritage designation registers
Frequently asked questions
Where do I find old maps of my area?
Start with the national mapping agency archive and the county or state library, both of which usually hold historic survey sheets, and add whatever digital map portal covers your country. Local archives hold tithe, enclosure or cadastral maps with field names and occupiers. Librarians and county archivists will often point you straight at the right series, which saves hours.
How do I find out who owns a field?
Through the land registry, county recorder or equivalent public land record rather than by asking at the nearest farmhouse. The person working a field is frequently a tenant, and on let land you may need permission from both the owner and the occupier. Confirming ownership before you knock also makes you look organised, which materially improves your hit rate.
What makes a site worth researching?
Evidence that people spent time standing still there: old paths and gates, fair and market sites, school and mill grounds, crossroads, picnic and sports grounds. Continuity helps too, since pasture that has never been ploughed keeps finds where they were dropped. Access and a reachable owner matter as much as history, because an unreachable site is not a site.
Can I detect a site I found on an old map?
Only after you have checked that the parcel carries no heritage designation, checked the local rules if it is public ground, identified the legal owner and been given permission. A map shows what was there, not what you are allowed to do. If the lead resolves to a scheduled monument, a protected site or a battlefield, drop it.
Should I share my research with other detectorists?
Share method freely and locations carefully. Clubs are an excellent place to learn which archives hold what and which local authorities permit detecting. Precise findspots on productive historic ground are conventionally kept between you, the landowner and the recording scheme, because published locations attract people who do not ask permission and get sites closed.
Researched, not professional advice. This page is compiled from published specifications, manuals and owner-review consensus, not hands-on testing. Target ID numbers, depth figures and settings vary with soil chemistry, moisture, target size, depth, orientation and firmware version, so treat every figure here as a starting point and verify it against your own machine's manual and your own ground. As an Amazon Associate we earn from qualifying purchases.