That's super cool! How old is he now?
He'll be 7 next Monday. Can't read the map properly yet, but if I orient it the right way at a control he'll generally point in the right direction for the next one.
And he's bloody fast so after my 90' run I had some serious trouble keeping up with him!
Good fun though - he kept checking the results list every 10 minutes to see if he was still top...