I'm interested in boundaries marked at Mavis Grind <https://osm.org/go/e7tUHqY_g-> (thanks to SK53 for the waterway=portage <https://wiki.openstreetmap.org/wiki/Tag:waterway%3Dportage> tag - Mavis Grind is an old Norse portage, still in use by Shetland Canoe Club).
1. Does anyone know if county boundary lines at the coast are set at mean low water? There's a gap between coastline (which I understand is MHW) and the county boundary: https://osm.org/go/e7tUHoc5F--?m=&way=669235281 2. "coastline" is very coarse - is it ok to make it follow the coast more finely, or is it some important legal line where it stands? (I've already done this on the east side of the portage, but then thought perhaps that was a no-no: https://osm.org/go/e7tUNAM7G?layers=D&m=&way=669235281) 3. Also, there are two walls visible on aerial imagery that all but match the doglegged county boundary as it crosses the isthmus. Is it safe to assume that these mark the actual boundary, and can I tug the boundary to match them? Or maybe assume the boundary is definitive, and the imagery is misaligned, so I should move the walls? Or leave well alone? West side: https://osm.org/go/e7tUHqdxn?m=&way=669235281 East side: https://osm.org/go/e7tUHrpqY?m=&way=669235281 Thanks as ever, Edward
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