In pictures: Ordnance Survey celebrates 80 years of the trig pillar

Ordnance Survey are celebrating the trig pillar’s 80^th birthday by asking you to share pictures of the trig pillars you’ve seen while out and about using the hashtag #TrigPillar80 on Twitter and Instagram.

We’ve had a look at what you have posted so far and you certainly are an outdoorsy adventurous bunch.

A photo posted by Calum McBride (@calumdmcbride) on Apr 19, 2016 at 4:16am PDT

A photo posted by Sarah Stead (@unsteady_s) on Apr 19, 2016 at 12:07am PDT

A photo posted by Victor Veedub (@victorveedub) on Apr 18, 2016 at 3:18pm PDT

A photo posted by Michael Rennie (@rennigade) on Apr 18, 2016 at 2:36pm PDT

A photo posted by @ltibbs on Apr 18, 2016 at 1:01pm PDT

A photo posted by Nathan Wood (@supernath45) on Apr 27, 2014 at 1:30pm PDT

A photo posted by Nathan Wood (@supernath45) on Apr 18, 2016 at 12:49am PDT

To find out more about trig pillars and to take part in the Trig Pillar Trail Challenge check out the Ordnance Survey Blog.