It’s close to 170 years since OS officially confirmed Ben Nevis as Britain’s highest mountain. It’s nearly 70 years since we carried out the last full survey back in 1949. Now we know in 2016 that the surveyors of a bygone age were just centimetres out in their calculations – testament to their extraordinary efforts and application.
In 1949 theodolites and other antiquities of surveying were the best friends of those mapping every nook and cranny of the British landscape. Now highly refined measuring devices, linked to an intricate network of land stations and a sky-full of satellites (yes up to 15 Russian, American and European ones) have been used to re-check the height of the mountain taking three surveyors just two hours to gather what it took an expeditionary force of surveyors 20 days to complete.