https://itunes.apple.com/gb/itunes-u/getting-your-bearings-for/id380228256The Open University 2009Learn how an ordinance survey map is produced before following three ramblers on a field trip in the Peak District. This material makes up part of the course MU120 Open mathematics.Getting your BearingsLearn how an ordinance survey map is produced before following three ramblers on a field trip in the Peak District. This material makes up part of the course MU120 Open mathematics.Getting your Bearings