An OS spokesperson explained: “Triangulation works by determining the location of a point by measuring angles to it from known points at either end of a fixed baseline. As I reached the paved path again I was wondering if it was sensible to bail off when I reached the Standedge trail path. Ling Hill is a mountain summit in the Ingleborough to Blackpool region in the county of Lancashire, England. Also known as Tor Hill, or simply 'the Tor' by locals, Musbury Tor is a conspicuous flat-topped hill that dominates the skyline on the approach into Haslingden from Accrington. As you head uphill here you feel like you’re heading towards Holme Moss radio mast which is in the distant, but eventually the path steepens and leads you across the plateau to Black Hill trig pillar.

After local government re-organisation in 1974, Turton was split and the tower became part of the new Borough of Blackburn and was administered by Lancashire County Museums Service. As it happens this one does and is well worn thanks to it being used by the gamekeepers to access the grouse butts nearby. You can see from the height of the Trig Pillar (around a metre above the surrounding ground) there has been significant erosion of the moorland since it was erected in 1945. Here you continue along the Pennine Way to reach the Millstone Edge trig pillar overlooking Castleshaw and Delph. Trig bagging is also a great activity for families, especially if you look for pillars that are located on smaller hills.Just me (on the pillar), my son (at its base) and my wife (behind the camera) being Silly at Rhossili on the Gower peninsula. Trig in vgc plastic plug set on little mound plug missing wet underfoot on way up followed PROW marked on 1:50.

If you have far to go then please do at least venture across the dam to get the best view up the valley including the valve tower. The things that traditionally get mopped up are "pockets of resistance" although even the most cliché-prone war correspondents tend to use this phrase only sparingly these days. Staring at an OS map it occurred to me my home in Marsden was surrounded by Trig points at some pretty good locations – and so the 6 Trigs circular was born! There is a viewfinder on Ladyhill, also in Elgin, it's not very accurate and I would be surprised if it's listed in the book.Parked by Res to East, Followed the muddy ROW to the Trig which is situated on a small hill, its in good condition , with a plastic cap and the sight holes are open . However, as anyone in the South Pennines knows, if you see a perfectly straight waterway marked on a map it’s an old waterway conduit and as such is highly likely to have a path running alongside it.

The spread of man’s impact on the land was starkly seen from on high with the vast industrial and residential spread of conjoined Blackburn, Darwen, Oswaldtwistle and Accrington.

The traditional triangulation pillar is just one of a number of different types used by the Ordnance Survey over the years. I'm not from the aristocracy - my middle name is Hugh which relates to the list of 282 hills in Scotland compiled by Sir Hugh Munro in 1891. Most trig points I've seen have been ugly lumps of concrete, created without a shred of imagination.