I've collected some interesting facts to consider about Triangulation Points (Trigs) & Cairns. Do you love or hate these man made apparitions that appear on virtually every hill that you ascend?Historically they've been a Love/Hate issue for many people. Getting the Measure of Height: Triangulation Points were designed for the Ordnance Survey in around 1935, nearly 100 years ago, by Brigadier Martin Hotine when it was realised that Britain's mapping was hopelessly out of date