the height was formerly shown on ordnance survey maps as 609 metres. the closeness of this figure to 609.6 metres, or 2000 feet, led to the summit being surveyed using precision gps and levelling equipment. the height was found to be 609.58 ± 0.1m, or fractionally below 2,000 feet. the result was discussed with the authors of the nuttalls, hewitts and deweys who all agreed that the hill should retain its current status as a member of dewey's list of hills at least 500 metres but less than 609.6 metres high. current os maps show the height rounded to 610 metres. the ordnance survey recalculated the height of the mountain in 2016 using the ostn15/osgm15 transformation to a height of 609.606 metres updating the status from hill to mountain.