The Land Registry and OS maps have more data, and it&#x27;s a shame they&#x27;re aren&#x27;t easily online.<p>It&#x27;s interesting to compare across Google Maps.<p>Grid reference: SO9644600362) near Coates (Gloucestershire) is an old roman fort.<p><a href="https:&#x2F;&#x2F;www.google.co.uk&#x2F;maps&#x2F;@51.7010323,-2.0505876,1017m&#x2F;data=!3m1!1e3?hl=en" rel="nofollow">https:&#x2F;&#x2F;www.google.co.uk&#x2F;maps&#x2F;@51.7010323,-2.0505876,1017m&#x2F;d...</a><p>EDIT: And the big lumps north of that are from the canal tunnel. These do not show on the Google map.