Those using Twitter can discover how Ordnance Survey Maps
are being made using the latest technology.
Surveyors using GPS
measuring devices to calculate heights within an accuracy of a few centimetres are also tweeting their news from the various locations where work is being carried out.
This includes both urban and rural locations, but it may also give those using walking maps an insight into the latest developments and confidence in the accuracy of such devices. GPS
is something that a team of mountain sleuths at G&J Surveys in north Wales have been using to check the heights of many mountains and hills, with some tick lists being changed as a result.
Their work in Scotland, sponsored by the Munro Society, has established that two peaks previously thought to be just above the critical 3,000 ft mark - Sgurr nan Ceannaichean and Bienn a'Chlaidheimh - are actually just below this height.