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OS re-measured Ben Nevis in 2016, and found it to be 1345m tall - one metre more than the last measurement in 1949. Find out more about the tallest mountain in Britain and how to climb it
In 1949 a team of OS surveyors carried 200lbs of equipment up Ben Nevis and its surrounding mountains. Taking multiple readings over 20 days, they waited till night so that the marker lights were visible, and then measured the angles between the peaks to calculate the height of Britain's tallest mountain. They measured the height to a little over 1,344m which has been the 'official' height ever since.
Field Surveyor Angus Hemmings was one of three surveyors who climbed Ben Nevis to take a new measurement using the latest GPS equipment, which is accurate to around 1cm. They found that the height was just a few centimetres higher than the 1949, but with rounding, this increased the official height 1345m.
"What it did do though, was give me a greater sense of respect for the 1949 surveyors. It took the surveyors 20 nights, because they only had three clear nights in that period to get it right. To do the best possible job it had to be run with military precision, everything they did had to be timed to perfection. Their effort and accuracy is remarkable.” - Angus Hemmings, Surveyor
Ben Nevis demands respect - even in summer. If you are planning on climbing it, you'll need:
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The simplest and most popular route up Ben Nevis. It begins at Achintee on the east side of Glen Nevis about 2 km (1.5 miles) from Fort William town centre. You can also join it from the Glen Nevis Visitor Center car park on the other side of the River Nevis where it can be easily accessed using the footbridge and following the path for to where it joins the Mountain Track.
The route is around 16.5km there and back and will generally take six too nine hours, depending on conditions and your normal walking speed.
For the more experienced walkers, starts at Torlundy North Face car park, a few miles north-east of Fort William on the A82 road, and follow the path alongside the Allt a' Mhuilinn. you can also follow the Mountain Track as far as Lochan Meall an t-Suidhe (halfway lochan) and taking the left fork. You will pass the spectacular North Face cliffs, Castle Ridge, Carn Dearg Buttress and Trident Buttress.
Take the steep ascent of Carn Dearg Meadhonach before an easier slope leads to Carn Mor Dearg and then continues along the breathtaking Carn Mor Dearg Arete before climbing steeply to the summit of Ben Nevis itself.
This one-way route starts from the car park in Glen Nevis at NN 167 691, passes by the ruins Steall.
This is a dramatic route, with a tough, steep climbs followed by a relatively level path. Crossing between Aonach Mor and Carn Mor Dearg is an energy-sapping descent and climb, followed by a relatively flat, but still challenging ridge walk to the peak.
From here you can follow the mountain path and continue to Fort William, or return the way you came. Total distance is about 21.3km, woth tough terrain, so this should also only be tacked by experienced walkers.
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Reaching the top of Britain's highest mountain is a challenge that is achievable for almost everybody, and should be on the to-do list for anyone with a love of the outdoors.