Britain's tallest mountain, Ben Nevis, is bigger than we thought
Media playback is unsupported on your device
Video

New technology shows Ben Nevis is higher than we thought

Ben Nevis, Britain's tallest mountain, is a little bit bigger than we thought. Thanks to improved GPS technology, the heights of many peaks or mountains are being reassessed, some with surprising results.

Go to next video: Lucky escape for Ben Nevis brothers