Cork City Marathon: Meet the unseen hero of road racing - the course measurer

The Irish Examiner Cork City Marathon is being run tomorrow. Michael Moynihan spared a thought for the unseen hero of road racing: the course measurer.

Travelling the country, you see the signs everywhere. 5k this Sunday. A charity 10k next weekend. Road races taking place in every village in Ireland.

Which begs the obvious, if eventual, question: who measures those courses? And how is it done?