How to always find north.
Item number 5 here
http://www.bbc.co.uk/programmes/articles/1g2gNvk4Gc4MwYqhtQ8KNlf/meet-the-cyborgs-five-people-who-have-modified-their-bodies-with-tech
and on the radio tonight here
http://www.bbc.co.uk/programmes/b08bzl96
Item number 5 here
http://www.bbc.co.uk/programmes/articles/1g2gNvk4Gc4MwYqhtQ8KNlf/meet-the-cyborgs-five-people-who-have-modified-their-bodies-with-tech
and on the radio tonight here
http://www.bbc.co.uk/programmes/b08bzl96