If you've got reasonable non-copyright evidence that there's a PROW across the field, use designation=public_footpath. If there's a path that people seem to use, use the highway=path tag (or some other highway tag if you prefer), and maybe a surface tag. You can have a OSM way with just a designation tag; it doesn't have to have a highway tag. Mapnik won't render it, but someone else might want the info; may as well record it while you're there.
Richard _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
